Trivia: Sheldon tells Penny not to sleep with her head close to the door because a headboard is always oriented away from the door; yet in later episodes, we see Sheldon in the exact sleeping spot that he told Penny not to sleep in. At this point I am referring to Pennys' sleep over whilst on Sheldons' couch.
Ssiscool
14th Oct 2025
The Big Bang Theory (2007)
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Suggested correction: Sheldon's headboard (and head) is against the wall on the wall opposite his door.
9th Apr 2025
The Big Bang Theory (2007)
The Paintball Scattering - S12-E11
Other mistake: When Penny and Leonard are in the paintball shack, Leonard won't shoot Penny because they are too close and it would hurt. Penny doesn't believe him, but eventually, he shoots her in the chest, and she says in pain, "You're right, we're way too close." But Penny should already know what this feels like; she was shot in the chest from close range in a paintball shack by Sheldon in one of the earlier seasons when she shot his cushion with a paintball. So this feeling shouldn't surprise Penny in S12.
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2nd Jun 2023
The Big Bang Theory (2007)
The Agreement Dissection - S4-E21
Corrected entry: Amy has a monkey in her apartment smoking a cigarette for a study. At one point, he asks for another cigarette. Amy gives him one and walks away without lighting it, but a few seconds later, he's puffing smoke.
26th Jun 2022
The Big Bang Theory (2007)
The Boyfriend Complexity - S4-E9
Corrected entry: Penny tells her father that Leonard has to work tomorrow. But then we see Sheldon come up the stairs carrying laundry. Everyone knows Sheldon fits his laundry Saturday night at 8:15. And Leonard works Monday through Friday.
28th Sep 2021
The Big Bang Theory (2007)
Continuity mistake: Raj talks in front of Penny near the beginning of the episode, then picks up dishes, walks toward the kitchen, and just disappears from the set.
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Suggested correction: Couple of points here, 1. Raj talking in front of Penny is already listed. 2. Raj doesn't pick the plates up until Penny has left after the Halo game. 3. He then stays in the kitchen area while we see Penny come back and settle down to go to sleep and Leonard and Sheldon go to bed and turn the lights out. Raj then creeps out the apartment and scares Penny.
19th Jan 2022
The Big Bang Theory (2007)
The Einstein Approximation - S3-E14
Character mistake: Sheldon is an extreme germophobe to the extent he doesn't even shake hands. There is no way he would be climbing around in a ball pit.
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Suggested correction: If he was acting normally (for Sheldon), he wouldn't. However, Sheldon isn't acting as he normally would due to lack of sleep, and his obsession with solving a problem.
The severity of his phobia would not be minimized by lack of sleep.
Sheldon's mind is distracted by the problem he is trying to solve. He grabs other people's food, he allows Raj to touch his food, he handles dirty cutlery at the cheesecake factory, All characteristics that would be present if he was acting normally. The fact that he is in the ball pit is simply an extension.
Severe sleep deprivation could certainly affect how Sheldon reacts to phobias. The brain requires sleep to function and with a severe lack of sleep, the brain is no longer able to send the signals that alert Sheldon to his fear of germs.
27th Apr 2008
The Big Bang Theory (2007)
Continuity mistake: Sheldon puts the bag in the bin at the start of the episode so that the handles are facing the ground. When he gets the bag out, the handles are at the top of the bin.
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12th Nov 2015
The Big Bang Theory (2007)
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.
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Suggested correction: Lying to Penny but not to his sister, not inconsistent with the characters and his relationships.
7th Sep 2019
The Big Bang Theory (2007)
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)
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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.
Sheldon knocks three times because he once walked into his parents bedroom and saw his father with another woman. He's been doing the triple knock since he was a teenager.
Yet, he didn't in the show till Season 2. Funny ain't it?
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.
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.
25th Feb 2019
The Big Bang Theory (2007)
Continuity mistake: In the early episodes, Leonard is depressed and buys cat stuff. He comments that he has taken in to account Sheldon's asthma with a hyper allergenic cat. Later in the series it is Leonard with asthma and Sheldon who gets all the cats.
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Suggested correction: Presumably Sheldon also buys non-allergenic cats.
20th Dec 2008
The Big Bang Theory (2007)
Revealing mistake: Most of the time, though not all the time, Leonard has no lenses in his glasses.
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Suggested correction: Not obvious at any point in the show.
1st Jun 2016
The Big Bang Theory (2007)
The Cooper-Hofstadter Polarization - S1-E9
Corrected entry: Howard explains how the signal travels to the lamp via various means and clicks to switch the lamp on. There is then a delay of around 1 second. However when he does the same thing for the stereo the sound starts instantly. (00:00:10)
Correction: Technically, when you use a network for the first time, there are many steps involved like creating a VPN, matching IP addresses, etc, hence the delay. Once you have connected and used it at least once, the go-betweens don't exist, hence there is no delay.
24th May 2019
The Big Bang Theory (2007)
The Big Bran Hypothesis - S1-E2
Other mistake: Leonard is awoken by the apartment door closing. When he walks into the living room the door is open. (00:08:55)
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Suggested correction: He's awoken by a door closing, not necessarily the front door. He could have heard Sheldon closing his door.
25th Feb 2019
The Big Bang Theory (2007)
Continuity mistake: In the beginning of the series Sheldon knocks on Penny's door only once. Later in the series Sheldon explains he has always knocked 3 times because he walked in on his father with another woman.
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25th Feb 2019
The Big Bang Theory (2007)
The Habitation Configuration - S6-E7
Corrected entry: Howard states in The Shiny Trinket Maneuver that he started doing magic to try to get girls to come to his room, but in this episode he tells her he started magic when his Dad left because it made his Mom happy and made her forget for a while.
Correction: He also may have gotten the idea for doing magic to get girls to his room, but actually started doing it to cheer up his mother.
6th Jan 2019
The Big Bang Theory (2007)
The Long Distance Dissonance - S10-E24
Corrected entry: Dr. Ramona Nowitzki returns and Sheldon introduces her to everyone as if they have never met her but, outside of Amy and Bernadette, they did years ago back in season 2. At the very least Leonard and Penny should remember her. But no-one acts like they do.
Correction: When bringing her to lunch with the other guys, Sheldon specifically says "You may remember Dr. Nowitski" and they reply. They obviously do remember meeting her.
26th May 2017
The Big Bang Theory (2007)
The Barbarian Sublimation - S2-E3
Corrected entry: When Sheldon is helping Penny with the game, we see Leonard, Howard and Raj discussing what's happening. However at this point Penny is still in the room and Raj has not been drinking so shouldn't be able to speak. (00:07:40)
3rd Nov 2017
The Big Bang Theory (2007)
The Rhinitis Revelation - S5-E6
Other mistake: When Mary is rubbing VapoRub on Sheldon's chest, she makes a comment that last time she saw that there was no hair, to which Sheldon replies "Yeah it filled in last year." In Season 1, Episode 11, Penny rubs VapoRub on Sheldon's chest and a very clear remark about chest hair was made. Season 1 for the show was 4 years ago.
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Suggested correction: Sheldon is probably joking when he tells Mary his chest hair filled in the previous year.
He doesn't understand sarcasm, hence, doesn't know when to be sarcastic.
And nearly all instances of Bazinga are not used in a funny circumstance. Indicating poor judgement and lack of knowledge regarding jokes.
They were funny to him. And to the audience.
3rd Nov 2017
The Big Bang Theory (2007)
Corrected entry: When Sheldon mentions to Leonard, Raj, and Howard that he is moving out, Raj asks Leonard "Did you pronounce the 't' in often?" This statement in context implies that it makes Sheldon angry when someone pronounces the 't' in often. However, Leonard and other characters do this multiple times throughout the series with Sheldon never commenting on it.
23rd Feb 2009
The Big Bang Theory (2007)
Corrected entry: When Leonard and Leslie are talking about assuming a relationship, in the cafeteria, the angle of the straw sticking out of Leonard's soda can continually changes throughout the whole scene. (00:06:05)