The Big Bang Theory
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The Luminous Fish Effect - S1-E4

Continuity mistake: When Leonard and Sheldon are walking downstairs, Sheldon stops and pins back up the caution tape that is in front of the elevator. Between shots, the other strip of caution tape untwists itself. (00:01:25)

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The Big Bran Hypothesis - S1-E2

Character mistake: Sheldon is wrong about the physics of pushing the furniture up the stairs. This is not just a question of work (energy) but also of power (energy/time). Since he and Leonard cannot produce an unlimited amount of energy per second, they may need to push it slowly, contrary to what he asserts. This is a very serious and very basic error for Sheldon considering he has a PhD in Physics.

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The Pancake Batter Anomaly - S1-E11

Continuity mistake: The way Penny holds her notepad when talking to Sheldon at the Cheesecake factory keeps changing instantly. (00:10:10)

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The Cooper-Hofstadter Polarization - S1-E9

Revealing mistake: When Leonard and Sheldon are fighting near the end they bump into the wall, which visibly shakes. (00:15:40)

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The Pancake Batter Anomaly - S1-E11

Factual error: Leonard's myopia is greatly exaggerated in this episode. Even with high myopia he should still be able to navigate his apartment without aid especially after living there for seven years. (00:17:40)

Tanngrisnir
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Pilot - S1-E1

Continuity mistake: During the scene where Penny, Sheldon and Leonard eat takeaway and converse, the blue throw hanging over the couch behind Penny continually changes from neat and uncreased, to messy and creased up. (00:08:40)

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The Loobenfeld Decay - S1-E10

Audio problem: When Sheldon is knocking on Leonard's door at the start, the sound is out of sync with the action.

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The Big Bran Hypothesis - S1-E2

Visible crew/equipment: When Penny is having a go at Sheldon and Leonard, there is a shot of some metal pans with stage lights visible in them. (00:12:30)

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Pilot - S1-E1

Continuity mistake: After Penny gets in the shower and throws her towel to the floor, the towel changes position in the next shot, as well as her boots and clothes on the counter as well. (00:15:50)

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The Dumpling Paradox - S1-E7

Factual error: Sheldon has a rigid schedule. Halo Night is known to be on Wednesday night. Penny sleeps on the couch in Sheldon and Leonard's apartment. The following morning, Sheldon cannot watch Doctor Who on BBC America because Penny is sleeping on his spot on the couch. He states that he has been watching Doctor Who every Saturday at 6:15 a.m. The following morning should be Thursday.

mizjo
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The Fuzzy Boots Corollary - S1-E3

Revealing mistake: When everybody is on their laptops at the beginning of the episode, you can clearly see in many shots that their screens are black. (00:01:20)

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Pilot - S1-E1

Continuity mistake: When Leonard, Sheldon, Penny, Koothrappali, and Wolowitz are driving at the end to get some dinner, the cars outside are constantly changing drastically.

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The Hamburger Postulate - S1-E5

Character mistake: When Sheldon knocks on Penny's door to seek advice about the tie on Leonard's doorknob, he does not use his typical triple knock. (00:07:43)

Upvote valid corrections to help move entries into the corrections section.

Suggested correction: Sheldon doesn't develop this trait until S2 E18.

Ssiscool Premium member

That I beleive is the first episode with the triple knock.

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First time he knocks 3 times is in Episode 2 of Season 1. First time knocking 3 times followed by saying the name is episode 10 of Season 1. The ritual of 3 knocks and 3 times saying the name and then stopping is Episode 5 of season 2.

lionhead

My mistake. It's been several years since I've seen the early seasons. I was going off memory.

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Suggested correction: A one-time lapse in someone's usual behavior does not count as a "character mistake", even in the case of someone given to ritualistic behavior as Sheldon is.

zendaddy621

Ah, but in an episode he explains he had developed this particular ritual at age 13 after walking into his parent's bedroom without knocking and seeing his father having sex with another woman. He says he started knocking 3 times since then and would never forget. So its not consistent and a mistake as this is not the only example one can name.

lionhead

The Middle Earth Paradigm - S1-E6

Visible crew/equipment: When Sheldon is being asked not to embarrass Leonard, the stage lights can be seen in the pans behind him. (00:05:10)

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The Luminous Fish Effect - S1-E4

Continuity mistake: When Sheldon's mom is saying the prayer, the bread roll that Raj is holding swaps hands, and then it disappears in the shot where she tells them they don't have to join in with the end of the prayer.

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The Peanut Reaction - S1-E16

Continuity mistake: In the electronics store, when the man asks Sheldon which hard drive he should buy in the first shot he is holding the green box in his left hand. Next shot it is under his arm. (00:12:50)

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The Big Bran Hypothesis - S1-E2

Visible crew/equipment: When Sheldon is mentioning about the coffee table having a garage sale, there is a shot of Leonard with all the stagelights reflected in the kettle. (00:06:40)

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The Bat Jar Conjecture - S1-E13

Continuity mistake: At the end, when Leonard is gloating over beating Sheldon, his position on the sofa keeps changing in relation to the arm. (00:18:50)

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The Dumpling Paradox - S1-E7

Character mistake: Wolowitz warns his fellow halo players that their enemy is "charging his Plasma Rifle". This is impossible since only the plasma gun can be charged up. (00:20:00)

dregj
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The Grasshopper Experiment - S1-E8

Continuity mistake: When Raj is drinking with Lalita in the bar Penny works at, in one shot he raises his Grasshopper drink to his lips with his left hand. In the next shot it's in his right (this is just before he says "Oh my God, you've lost so much weight").

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The Extract Obliteration - S6-E6

Stephen Hawking: Do you like brain teasers?
Sheldon Cooper: Oh, I love brain teasers.
Stephen Hawking: What do Sheldon Cooper and a black hole have in common? They both suck. Neener, neener.

More quotes from The Big Bang Theory

The Holographic Excitation - S6-E5

Trivia: In this episode, Sheldon and Amy are trying to decide on couples' themed Halloween costumes. Sheldon is standing in front of the dry erase board. There are 2 columns written on the board. One named "Couples I Like" and the other "Couples You Like." Under the "Couples You Like" column, one of the couples is Blossom and Joey. Blossom is the name of the television character played by Mayim Bialik in the 90s and Joey was one of her brothers.

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