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Easter eggs
Hidden details in every movie and series: 63 in total. Tap a poster to see its eggs. Titles you haven't marked as seen stay locked so nothing gets spoiled.
- Referencenod to comics or other movies
- Cameoa familiar face shows up
- Setupplanted now, pays off later
- Behind the scenesproduction trivia
- Behind the scenesJon Favreau directed the pilot
The first episode was directed by Jon Favreau, the director of Iron Man. He also executive produced the pilot.
source ↗ - Behind the scenesYoung Mary is adult Mary's daughter
Zoe Perry, who plays Mary Cooper, is the real-life daughter of Laurie Metcalf, Mary on The Big Bang Theory.
source ↗ - ReferenceWhere Soft Kitty comes from
In episode 13, during flu season, Sheldon gets sick and Mary sings him Soft Kitty. It's the origin of the song The Big Bang Theory fans know.
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- ReferenceA violin, Einstein style
In episode 17, Sheldon tries the violin to copy his hero Albert Einstein, who played it.
source ↗ - ReferenceSheldon's future friends
In the finale, the Nobel announcement plays over a montage of The Big Bang Theory's main characters as kids, in their own homes.
source ↗ - Behind the scenesThe voice behind the theme
The opening plays 'Mighty Little Man,' sung by Steve Burns, the original host of Blue's Clues.
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- ReferenceSheldon discovers Middle-earth
In episode 4, Sheldon gets so hooked on The Lord of the Rings that he has to take a break from science.
source ↗ - SetupFirst trip to Caltech
Episode 16, 'Pasadena,' takes Sheldon to Caltech for the first time. That campus will matter a lot down the road.
source ↗ - Behind the scenesA season cut short
Warner Bros. halted production on March 13, 2020, due to COVID-19, so the season ended at 21 episodes.
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- ReferenceNo training wheels before college
In episode 3, with college on the horizon, Sheldon sets out to ride a bike without training wheels.
source ↗ - Behind the scenesA universe where Missy is the genius
In episode 17, 'A Black Hole,' the family imagines an alternate universe: Dr. Sturgis is a cowboy, Georgie is bald, Missy is the genius and Sheldon is a normal kid.
source ↗ - ReferenceProfessor Proton on the wall
In episode 18, Missy rips up Sheldon's picture of Professor Proton, his TV science hero. The character also shows up on The Big Bang Theory.
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- CameoLance Reddick teaches engineering
In episode 7, Sheldon starts Professor Boucher's engineering class. Boucher is played by Lance Reddick of The Wire and John Wick.
source ↗ - CameoMing-Na Wen joins the lab
In episode 14, Sheldon clashes with Dr. Carol Lee, the lab's new scientist, played by Ming-Na Wen.
source ↗ - SetupThe weather girl
In episode 11, Georgie falls for an older woman: Mandy, played by Emily Osment. She'll matter a lot.
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- CameoMeet the McAllisters
In episode 7, Georgie meets Mandy's parents, Jim and Audrey, played by Will Sasso and Rachel Bay Jones. Both come back later.
source ↗ - Behind the scenesEmily Osment joins the main cast
After guest spots, Emily Osment was made a series regular this season as Mandy McAllister.
source ↗ - SetupA summer in Germany
In the final episodes, Sheldon wants to study abroad and gets ready for a summer in Germany. What happens there comes later.
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- CameoGrown-up Sheldon and Amy
In the finale, Jim Parsons and Mayim Bialik return as Sheldon Cooper and Amy Farrah Fowler, on screen this time, not just in voice-over.
source ↗ - Behind the scenesA wedding that became a show
Georgie and Mandy marry in episode 7. A spin-off about the two of them was announced in January 2024.
source ↗ - Behind the scenesJust 14 episodes
The seventh and final season ran 14 episodes; the show's end was announced in November 2023.
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- Behind the scenesOn The Big Bang Theory's stage
Unlike Young Sheldon, the show tapes before a live audience, on the same Warner Bros. stage in Burbank where The Big Bang Theory was filmed.
source ↗ - CameoMandy's ex
Christopher Gorham joins as Scott, Mandy's ex from her San Antonio days and now her boss at the station.
source ↗ - ReferenceMeemaw's still in the game
In episode 14, Mandy finds out Meemaw runs an illegal sportsbook, the next step after her schemes on Young Sheldon.
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- ReferenceBack on the weather
In episode 2, Mandy becomes the weekend weather girl, the job she had when she met Georgie.
source ↗ - ReferenceA scoreboard for George
In episode 18, Georgie tries to honor his dad, Young Sheldon's football coach, with a new scoreboard.
source ↗ - CameoFagenbacher, the rival
Fred Fagenbacher, the rival shop owner, is played by Matt Letscher and keeps getting more screen time.
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- Behind the scenesThe pilot nobody saw
The first, rejected pilot had no Penny: the neighbor was Katie, a tough-as-nails woman. The theme was 'She Blinded Me with Science.'
source ↗ - Behind the scenesThe physics is real
UCLA physics professor David Saltzberg checked the science dialogue and the equations on the whiteboards.
source ↗ - CameoSheldon's mom arrives
In episode 4, Laurie Metcalf debuts as Mary Cooper, the one person who can get Sheldon in line.
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- CameoLeonard's mother
In episode 15, Christine Baranski debuts as Beverly Hofstadter, Leonard's cold, analytical mother.
source ↗ - CameoA Terminator on the train
In episode 17, 'The Terminator Decoupling,' the guys run into Summer Glau of Terminator: The Sarah Connor Chronicles.
source ↗ - SetupOff to the North Pole
In the finale, Sheldon lands funding for a three-month Arctic expedition and brings Leonard, Howard and Raj. The trip matters next season.
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- CameoWil Wheaton, archenemy
In episode 5, Wil Wheaton, Star Trek's Wesley Crusher, plays himself as Sheldon's rival at a card tournament.
source ↗ - CameoExcelsior!
In episode 16, 'The Excelsior Acquisition,' Stan Lee shows up as himself.
source ↗ - Behind the scenesA real neuroscientist
Mayim Bialik, who debuts as Amy in the finale, holds a real PhD in neuroscience, the same field as her character.
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- CameoSteve Wozniak drops by
In episode 2, Apple co-founder Steve Wozniak appears as himself.
source ↗ - Behind the scenesPenny behind the bar
Kaley Cuoco broke her leg during the season. To hide the cast, Penny moved behind the bar at the Cheesecake Factory.
source ↗ - CameoLeVar Burton stops in
In episode 17, LeVar Burton, Star Trek's Geordi La Forge, appears as himself.
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- CameoSpock's voice
In episode 20, Leonard Nimoy voices the Spock action figure that talks to Sheldon in a dream.
source ↗ - CameoStephen Hawking in person
In episode 21, 'The Hawking Excitation,' Stephen Hawking appears as himself.
source ↗ - Behind the scenesA Soyuz built from NASA photos
The finale's Soyuz capsule and space station sets were built from NASA photos, with help from astronaut Mike Massimino, who also plays himself.
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- CameoBob Newhart is Professor Proton
Bob Newhart debuts as Professor Proton, Sheldon's childhood hero, and won the guest actor Emmy for the role.
source ↗ - Behind the scenesStuart gets promoted
Kevin Sussman, comic store owner Stuart, became a main cast member this season.
source ↗ - Behind the scenes20 million viewers
'The Bakersfield Expedition' was the show's first episode to top 20 million U.S. viewers.
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- CameoA night out with James Earl Jones
In episode 14, James Earl Jones, the voice of Darth Vader, takes Sheldon on an unexpected night on the town.
source ↗ - ReferenceBlessed by Lucasfilm
Episode 22, built around Star Wars, was made in collaboration with Lucasfilm.
source ↗ - Behind the scenesKaley Cuoco-Sweeting
Starting with episode 14, Kaley Cuoco is credited as Kaley Cuoco-Sweeting after her December 31, 2013, wedding.
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- Behind the scenesGoodbye to Mrs. Wolowitz's voice
Carol Ann Susi, the voice of Howard's mother, died in November 2014. The show addressed the loss in episode 15.
source ↗ - Behind the scenesA million per episode
Before the season, Johnny Galecki, Jim Parsons and Kaley Cuoco renegotiated and reached $1 million per episode.
source ↗ - SetupA little box at the end
The last scene shows Sheldon alone with a ring box. What he meant to do with it comes later.
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- ReferenceA Star Wars-style crawl
Episode 11 opens with a Star Wars-style crawl: the guys have opening-night tickets to The Force Awakens.
source ↗ - CameoJune Squibb's Meemaw
In episode 14, June Squibb debuts as Meemaw, Sheldon's grandmother.
source ↗ - CameoAdam West for episode 200
Episode 17, the show's 200th, brings in Adam West, TV's 1960s Batman, as himself.
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- CameoPenny's family
Katey Sagal plays Penny's mother, Susan, and 30 Rock's Jack McBrayer plays her brother, Randall.
source ↗ - CameoDoc Brown drops in
In episode 10, Christopher Lloyd, Back to the Future's Doc Brown, appears as Theodore.
source ↗ - CameoHank joins the military project
Dean Norris, Breaking Bad's Hank, plays Air Force Colonel Williams on the gyroscope project.
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- CameoLuke Skywalker officiates
In episode 24, Mark Hamill plays himself and officiates Sheldon and Amy's wedding.
source ↗ - CameoAmy's parents
Kathy Bates and magician Teller of Penn & Teller show up as Amy's parents at the wedding.
source ↗ - ReferenceNeil, Neil and Neil
In episode 16, Howard and Bernadette name their son Neil, after Neil Armstrong, Neil Gaiman and Neil Diamond.
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- CameoAn all-star D&D table
In episode 16, 'The D&D Vortex,' William Shatner and Wil Wheaton join a secret Dungeons & Dragons game.
source ↗ - CameoReal Nobel laureates
In episode 18, Nobel laureates George Smoot, Kip Thorne and Frances Arnold play themselves.
source ↗ - Behind the scenesWhy the show ended
CBS announced the end in August 2018 after Jim Parsons decided to leave at the end of season 12.
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