Corrected entry: When the guys are practising for the Physics Bowl and they are sitting across from Penny, Leonard is sitting in Sheldon's seat, which Sheldon would never allow.
Correction: In most cases, this would be true. But given the way things were set up, he had to pick a new, temporary spot for the practice. It's likely that their living room setup is too complex to change just for a short amount of time, which is why the practice area was set up as it was. Sheldon chose a spot related to the practice area so he would be comfortable, just like he chose a new spot when the gang went to the north pole.
Corrected entry: Penny's father says, "I want grand kids before I die, and I want them to grow up in a house without wheels," but in season 2, E20, Penny asks Leonard to buy a comic book for her 13 year old nephew. Her nephew would be her father's grandson.
New this week Correction: Her mother may have had a child with another man before marrying her father, which would make the nephew a step-grandson and not a "real" one in her father's eyes.
Corrected entry: When Sheldon comes to tell Leonard and Penny his perfect joke he is wearing a plain green T-shirt, but when Penny leaves and he begins to tell Leanord about it, his shirt now has a black symbol on it.
New this month Correction: The symbol is there the entire time. It's just very difficult to see.
Corrected entry: After the opening credits, Penny walks into the room talking about a doctor she's not been able to see, saying "I've been trying to get him for months". A few seconds later she says the doctor is a woman.
New this month Correction: Penny says "I've been trying to get in for months."
Corrected entry: When Sheldon realises his mistake in reading sq centimeters as sq meters he says "I am off by a factor of 10,000" when in actuality such a mistake would be by a factor of 100.
Correction: No, he's right - 2cm x 2cm (for example) would be 4 sq cm. 2m x 2m (200cm x 200cm) would be 40,000 sq cm - off by a factor of 10,000.
Corrected entry: Bernadette says the thing she loves most about Howard is his chest hair to which the other girls say "he has a hairy chest?" and she replies "Nope, just one" but a few episodes later they are in bed and Howard has a full chest of hair.
Correction: She's just making a joke.
Corrected entry: At the end of the episode, Sheldon runs off to Texas. That would be impossible in the short time frame the episode was set in. Especially since they live in Pasadena, California. California is 18 hours away by car from Texas. It has also been stated previously that Sheldon dislikes cars and airplanes a lot.
Correction: Just because he dislikes planes, doesn't mean that he will never go on one, as proven by him traveling by plane to Texas with Howard.
Corrected entry: When the guys are locked in the basement, the door hinges are on their side. You would think a theoretical physicist, experimental physicist, astrophysicist, and NASA engineer could together figure out to simply take the pins out of the hinges.
Correction: It's not that they couldn't do it. It's that they're in a room full of stuff they find awesome. They're having too much fun to try that hard. They don't care if they get out.
Corrected entry: It's revealed that Sheldon rents out a storage unit that contains literally everything that he has ever owned in his lifetime. How is it that nobody else has ever known about this? He doesn't drive, nor does he take public transportation, and we can assume that he must make regular trips there to store any item that he no longer needs/uses. So he would surely need to be driven there by someone, most likely by Leonard, and he obviously couldn't keep it a secret as to why he needs to go there.
Correction: While Sheldon does not like public transportation, he does take the bus when needed. There are numerous mentions of "bus pants" and "bungee cording himself to the seat" to prove he will take a bus when he has to.
Corrected entry: When they are marrying Bernadette and Howard, Raj is speaking straight to the women without alcohol. And it's the same people as he normally can't talk around.
Correction: Although no alcohol is shown onscreen, it doesn't necessarily mean he hadn't already drank any alcohol already. There's nothing there to say whether or not he quickly had a drink before the ceremony, off-screen, whilst they were setting up on the roof.
Corrected entry: Penny takes Sheldon's onion ring and holds it with 2 hands. Camera cuts and one is hand is down in her lap.
Correction: The camera doesn't cut from Penny having two hands on the onion ring to just one hand. After Penny picks up the onion ring with two hands, the camera cuts to Raj squealing at her for a moment. She could have easily let go of the onion ring and put her hand down on her lap during this shot.
Corrected entry: Several times throughout the show, Leonard makes reference to having sleep apnoea, a condition where the airways close up when you are asleep and you stop breathing for periods of time before your body's reflexes kick in and wake you up. However we also see him sleeping numerous times but he doesn't have any form of cpap (Continuous Positive Airway Pressure) machine. This is vital for anyone who has sleep apnoea as it pumps air into the users airways via a nasal cannula or face mask to keep the airways open and stop the user from stopping breathing. Since sleep apnoea in the most extreme cases can cause death (depending on type of sleep apnoea) a cpap machine is vital and should be seen whenever we see Leonard sleeping or in bed.
Correction: There is no mistake simply because he chooses not to use one (if he even owns one). There are individuals with sleep apnea who don't use them and just deal with waking up in the middle of the night. If Leonard says he has to use a CPAP machine every night and then is seen not using one at night, that could qualify as a mistake, but this isn't the case.
Corrected entry: When using the whiteboard at the beginning, Raj writes "7:11" on the board with a red marker. Later on when Sheldon returns to the apartment with Red Vines, this has vanished from the whiteboard although nobody rubbed it out.
Correction: There is a red smudge where 7:11 was written. There was enough time for Sheldon to go out get Red Vines, so there was time for him to rub it off when on his own.
Corrected entry: Sheldon is very particular about sitting in his spot and not allowing anyone else into his spot. We learn later on in the series that he has been this way since Leonard moved in. However at the very end of this episode, we see Leonard sat in Sheldon's spot and Sheldon sat in the arm chair.
Correction: At the start of the scene, Sheldon attempts to sit in his spot, but Leonard doesn't let him, because his Physics Bowl trophy is sitting there and then Leonard moves slightly onto Sheldon's spot to make fun of him using the trophy. Presumably, he is just sitting on the arm chair because Leonard wouldn't move and he is just sitting in that seat reluctantly.
Corrected entry: Sheldon's battery runs low during Leonard's date with Leslie so he gets an extension cord but leaves the door open. As he goes down the stairs the extension cord unwinds until he can't go any further and attempts to pull it. Then Leonard gets to shut the door easily like there is no extension cord plugged into the outlet and leading out of the apartment.
Correction: Having just watched this the lead goes slack and under the door.
Corrected entry: At the start when Sheldon and Leonard are sitting at the table, and then talking with Dennis, their soda cans on the table keep rotating themselves and the straws in them change position a couple of times too.
Correction: The rotating of the cans is due to the various camera angles being used in the shot. Same with the straws.
Corrected entry: When Leonard is standing outside the apartment his hair is tucked under the band of the wireless cam he has on his head, but when he is crawling on his hands and knees through the apartment his hair is out from under the band and is hanging in front of his face.
Correction: They also find a gift bag in this time so it's clear there has been a gap of some time. Enough to sort the headband out.
Corrected entry: Characters in Halo games can never be decapitated, as Penny states about Sheldon's player character.
Correction: Penny says "whose head did I just blow off?" This can merely be an expression for killing someone. Not necessarily a literal reference.
Corrected entry: Sheldon is an obsessive compulsive and picky person and he picks a pre-designated seat in all places. When he enters Penny's apartment to talk to her he promptly sits on the couch, which was not where he chose 'his seat' to be in the last episode of the first season. It seems out of character that he would sit there when he has a ready-chosen spot and that his nature is as it is.
Correction: In the season 1 episode mentioned, Sheldon says he thinks it could be his spot. Not decided, so there is no reason to assume he is completely set on that spot and he could have changed it.
Corrected entry: When Leonard returns from talking with Penny, the guys are playing Talisman. Stat counters are randomly placed on the board, when they should always be associated with cards. Then Howard rolls "double sixes" - in Talisman you advance your character by rolling a single die. Raj then acquires a sword without rolling - only the character that rolled would have acquired an item without additional gameplay.
Correction: Fountain of Wisdom, Pool of Life, and Magic Stream all put stat counters on the board to be picked up by whomever passes by. A Horse allows one to roll two dice for movement, and Market Day or Acquisition would allow someone to acquire items out of turn.