The Big Bang Theory
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The Loobenfeld Decay - S1-E10

Continuity mistake: When Penny is telling Howard and Raj about Sheldon's "drug addicted cousin" her scarf keeps jumping in and out of her jacket.

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The Cooper-Hofstadter Polarization - S1-E9

Continuity mistake: The video of the fight we see on Youtube is different to what we saw earlier in the episode.

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The Loobenfeld Decay - S1-E10

Continuity mistake: In nearly every episode, Sheldon demonstrates his OCD when he knocks three times on a door, says a person's name, and repeats that sequence twice, for a total of three iterations, but in this episode he radically departs from that behavior not once but twice. First, wanting to talk to Leonard, he knocks four times, says "Leonard" and repeats the sequence three times for a total of four iterations. Later, wanting to talk to Penny, he knocks four times and says her name, repeating that sequence at least four more times. Given that this was the first season, I assume the writers had not yet settled upon the 3x3 routine as a comic behavior.

Matt Wills
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The Grasshopper Experiment - S1-E8

Continuity mistake: When Raj's parents tell him to put his laptop down and gather his friends, they all huddle around the one-seat sofa. Sheldon is crouched to the left of the seat with his hands on the sidearm, yet in shots angled at the left he has disappeared from his place (as to not obstruct these particular angled shots.) (00:02:00)

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The Pancake Batter Anomaly - S1-E11

Continuity mistake: After Leonard gives Penny her pile of mail, she alternates from holding the pile by her side to at her front between each shot. (00:01:10)

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Pilot - S1-E1

Continuity mistake: When Penny is in the shower, there is a red comb on the cistern of the toilet. In the next shot, it has moved without anyone touching it. (00:15:50)

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Season 1 generally

Continuity mistake: In "The Luminous Fish Effect" (S1E04) Sheldon tells Penny he weighs 140 pounds. In "The Porkchop Indeterminacy" (S1E16), he tells his sister he weighs 165. 25lbs difference would be a noticeable change, but he looks the same.

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

Suggested correction: Lying to Penny but not to his sister, not inconsistent with the characters and his relationships.

LordKelvin

There's been several episodes showing Sheldon is not a good liar.

Bishop73

The Loobenfeld Decay - S1-E10

Continuity mistake: During the whole opening scene, the way in which Leonard holds the letters in his hands keeps differing.

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The Pork Chop Indeterminacy - S1-E15

Continuity mistake: When Sheldon says that his sister was sent to spy on him, his arms are behind his back. Camera cuts and they are now at his side.

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The Peanut Reaction - S1-E16

Continuity mistake: When Penny asks Sheldon "What trauma?" in the electronics store, Sheldon holds two boxes - one with an orange side on top of one with a black side. In the next shot the black sided box is on top of the orange one. The boxes then continue to swap places during the whole scene. (00:11:50)

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The Dumpling Paradox - S1-E7

Continuity mistake: When Leonard and Sheldon are talking with Penny during the scene where she is being allowed to sleep on their couch, the pullstring on her hooded jacket keeps alternating from hanging loose to being caught inside the top of the jacket. (00:07:40)

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The Pancake Batter Anomaly - S1-E11

Continuity mistake: When Sheldon walks out his bedroom wrapped in a comforter, he drops it on the higher level before the drop down to the kitchen. In the next shot as he walks away from the fridge, half of the comforter is now spread over the lower level without anyone moving it. (00:05:10)

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The Middle Earth Paradigm - S1-E6

Continuity mistake: When Leonard is talking to Sheldon in the kitchen about the party, Sheldon is pouring juice. In one shot he places the bottle cap on the bottle yet in the next shot his hand is down on the counter with the lid in it. (00:04:50)

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The Nerdvana Annihilation - S1-E14

Continuity mistake: In the scene where Leonard is packing up his collectables to sell, at 15:32 he is dusting what appears to be a Hasbro Marvel Legends Yellow jacket figure, which also has a yellow post-it on the back. At 15:42 he is still dusting a figure but he now holds a different (darker but not yellow) figure from the same series, with no post-it on the back, and the Yellow jacket figure is now on the table (house left of the box of collectables). At 15:56 The Yellow jacket figure has disappeared from the table, and it is not the figure in Leonard's hands either. (00:15:30)

biggs33
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The Loobenfeld Decay - S1-E10

Continuity mistake: When Sheldon is talking with Leonard in the kitchen at night, as he pours himself a mug of milk the mug moves between shots. (00:04:50)

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The Big Bran Hypothesis - S1-E2

Continuity mistake: When Sheldon is cleaning, he moves an iPod dock and the iPod lights up. Camera changes and the iPod is unlit. A few shots later it's lit again. (00:09:00)

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Pilot - S1-E1

Continuity mistake: When Sheldon sits in his spot his hand and one leg are on his knee. Camera cuts and they are both down. (00:11:50)

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Pilot - S1-E1

Continuity mistake: When Sheldon goes on his rant about star signs, Penny has her hair tucked behind her ear. Camera changes and it isn't. (00:09:50)

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Pilot - S1-E1

Continuity mistake: When eating at the start, the position of Sheldon's container keeps swapping in his hands. (00:09:00)

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Pilot - S1-E1

Continuity mistake: When Sheldon is told to sit he does so with his legs crossed. Camera changes and they aren't. (00:08:50)

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The Habitation Configuration - S6-E7

Continuity mistake: When Howard is almost done moving out of his mother's house, there is a table in front of him with a measuring device in the top corner. In one shot, the device moves to the opposite corner of the table. In a few shots later, the item returns to its original position.

bobthedancingdonut
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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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