Corrected entry: During a conversation between Santana and Brittney, when Santana had stepped in to play "Rizzo", Brittney mistakenly refers to "Unique" as "Mercedes", as in his parents wants him to be a boy.
A Very Glee Christmas - S2-E10
Corrected entry: In "A Very Glee Christmas," Artie receives a ReWalk. Over the following seasons he is never seen using it. If this was the only way he could possibly walk, why doesn't he use it?
Corrected entry: When the football team is dancing during the game, they cross the scrimmage line, and would actually be counted as a foul and should have been stopped by officials immediately.
Correction: Should have yes, but officials make mistakes all the time, even NFL level officials. This time, everyone was so dumbstruck to see the dancing at all that no one noticed they'd crossed the line.
Corrected entry: When Will flunks the Cheerios in "Throwdown", Quinn, Santana and Brittany are still at warm-up, implying they are not failing Spanish. But how could Brittany be passing Spanish when she has such a low intelligence and is even seen trying to steal Quinn's test, saying, "I just don't understand anything"?
Corrected entry: In "Hello", when Sue takes a picture of herself with Figgins in his bed, look very closely and you'll see that the camera only takes a picture of Figgin's right side and some of Sue's stomach. In reality, this photo would be no good as blackmail, as neither of their faces are even in the photo.
Correction: Figgins isn't seeing it from our angle, he's just woken up drugged and naked in a bed with a woman who snapped a picture of the two of them and not likely to ask if it's a good picture or not. As long as he thinks it is, it's good blackmail material.
A Very Glee Christmas - S2-E10
Corrected entry: At the end Artie is given a ReWalk by Coach Beiste to help him walk again. However, at the time, the ReWalk was only available for use in rehabilitation centers, and not yet for personal use. In addition, it's highly unlikely that Coach Beiste would have the funds to buy a ReWalk.
Correction: The ReWalk became commercially available in January of 2010. Since it's entirely likely that a high school football coach might have contacts in the field of Sports Medicine, Coach Bieste probably just pulled a few strings and got one a few days early.
The Rocky Horror Glee Show - S2-E5
Corrected entry: When Finn and Rachel are singing "Dammit Janet" during "The Rocky Horror Glee Show", the shape of the heart that Finn drew on the whiteboard behind them changes several times.
Correction: This is a deliberate mistake and a tribute to the original Rocky Horror film, where the shape of the heart changes. Most people think this error was deliberate in the original film too.
Corrected entry: The posters that Lauren puts up of Quinn's former appearance say "Vote for Lucy Caboosey" on them, yet Quinn only told Lauren she used to be called 'Lucy Caboosey' about 5 minutes earlier.
The Sue Sylvester Shuffle - S2-E11
Corrected entry: During the scene where Rachel and Mercedes go and have coffee with Kurt and Blaine, on the cups half-hidden beneath the cardboard are the characters names, this is most noticeable with Rachel's and Blaine's cups.
Correction: Many coffee houses write the person's name on the cup so the barista knows what name to call out when the drink is finished being made. Not a mistake as it is the character's name on the cup, not the actor's.
Corrected entry: The sale of such a large amount of Pseudoephedrine tablets to Howard would not have been allowed as it probably would have exceeded the daily and monthly limits of Pseudoephedrine sales to a single person as stated under US and Ohio law.
Correction: It is indeed not allowed, which was why Howard was arrested when trying, rendering this whole post pointless.
Corrected entry: In the episode Vitamin D (Season 1, Episode 6), Terri gives Finn and the other Glee kids Pseudoephedrine tablets, telling them that Pseudoephedrine is the ingredient which makes decongestants non-drowsy. This isn't the case: Pseudoephedrine is itself the decongestant, which has a side effect in some people of promoting excitability. It certainly would not have made the kids as jumpy and energetic as they are shown to be.
Correction: Terri is an idiot and could easily make this character mistake. The power of suggestion easily explains the jumpy energy as well. I gave a single caffeine tablet to a friend who'd never had them before and he wigged out.
Corrected entry: During "Wheels", Puck says that "[Brittney] is always cheating off [Becky]'s test papers in math class." Yet in a previous episode, he says he hasn't been to a math class in three years.
Correction: That does not mean that he isn't aware that Brittney cheats off of Becky.
Corrected entry: During "Home", when Sue is talking about the Master Cleanse, she says she hasn't had a solid meal since 1987. Yet in a previous episode "Mattress", when she talks about having eye surgery, she is eating a container of lasagna. I'm pretty sure lasagna counts as a solid meal.
Correction: It was yams, not lasagna. And I'm pretty sure it was a joke, and supposed to be absurd, not necessarily a continuity error.
Corrected entry: Rachel Berry is supposedly a Vegan, yet during one of the bowling scenes in "The Rhodes Not Taken", she and Finn are seen sharing a pepperoni pizza.
Correction: She's also on a date with a boy that she's attracted to, lots of people set aside principles in such situations.
She does the same in "Thanksgiving" (4x08), when she tells Brody that she is a vegetarian and precedes to prep it with him, once again proving your point.
Corrected entry: During "Night of Neglect", Will writes on the board that 5,000 times 0.25 is 20,000. That's incorrect, 5,000 times 0.25 is actually 1,250.
Correction: It's actually 5000 / 0.25 = 20,000 He's saying they would have to sell 20,000 pieces of Taffy at 25cents each to get $5000.
Correction: This was as a joke, as revealed in a cast interview. They knew that the math was incorrect but kept it.
Corrected entry: Throughout the show, the character's lockers continually change position. For example, Rachel's locker is at first near the end of a row, a few down from Quinn's, yet later it's in the middle of the row, nowhere near any of the other Glee kid's lockers, and even later it's the second one down in a completely different row.
Correction: Students can request that they be moved to a new locker if theirs is too far away from their classes or someone might be bullying them at their lockers. Given how often the Glee kids are pranked and/or bullied, they probably have to move lockers frequently.
Correction: Brittany often refers to Unique as Mercedes because she thinks they are the same person.