Corrected entry: Across the whole show, the infamous wall in Rachel's room / guest room (Monica's apartment) changes. When the room is not being filmed, the wall is as normal, but on quite a few episodes, when the room is actually used for scenes, the wall is much shorter. In both the episode where Ross buys Phoebe a bike, and where Phoebe and Rachel have to live with Monica after their apartment caught on fire, people are able to walk straight into the room without the wall being in the way.
Correction: Just rechecked the bike episode (the one with all the candy) and compared to season 8's the one with the stripper which shows Joey and Chandler entering the room. The camera angle from the main room is at nearly 45 degrees, the wall is not longer in that scene it is just the angle of the shot, which is the standard angle used from the main room when viewing it.
Corrected entry: Chandler and Monica's wedding day is May 15th 2001, as mentioned on the show. In Series 9, some time in January 2003 (as it is after the characters have celebrated Christmas and New Year), it is established that Rachel has been on maternity leave for five months, which means she took her leave in August. Since she realised she was pregnant in May the year before, when Monica and Chandler got married, this means her pregnancy lasted from April/May 2001 to August/September 2002, a time span of 16 to 17 months. This cannot be explained by saying that episodes don't have to take place in the month they air, as we are given the dates by the characters on the show.
Correction: There's a slight flaw with the original author's observation, and we don't necessary have contradicting time frames. Remember, Rachel doesn't necessarily: A) Start her maternity leave immediately after Emma is born and/or B) Take her leave in one contiguous chunk. (Some companies allow leave to be used in segments.) So we don't necessarily have a guaranteed contradiction of timelines if one of A) or B) didn't happen.
Corrected entry: When Rachel is holding the cat on the cushion with the red oven mitt, for one shot her hand changes from holding the cat, to holding the pillow.
Correction: I just watched this episode, and you can actually see her move her hand from the cat to the pillow and back again.
Corrected entry: When Chandler finds out that the video marked 'Monica' is just a football game he says, 'This may be the first time I have enjoyed football. Although in 'TOW The Football' he is quite happily watching the Thanksgiving Day game.
Correction: In TOW the Football, he is watching football to avoid helping cook dinner. He does not say he is enjoying it.
Corrected entry: The wedding is threatened because Ross, Emily, and Monica discover that the location has been torn down a few days early. However, when one plans an event, especially a wedding, one puts down a deposit to hold the location, signs a contract, and has all of that in writing. The church would not have allowed the tear-down to happen early as they'd be in breach of contract for accepting money and then allowing the church to be torn down before the wedding. And if they had broken the contract, Monica would have been screaming about it and demanding a refund.
Correction: They decided very fast to get married. They didn't have a place and they were just going to check that place. Maybe they were hoping to close the deal that day.
Corrected entry: When Monica and Chandler are in the bath, she goes under the water as Joey comes in, and when she reappears her wine glass is still full of wine. It would have filled up with water, not stayed with just wine.
Correction: When Monica surfaces, it is actually Chandler's glass which is in shot and has never been underwater. Monica's glass isn't seen again.
Corrected entry: When Alan arrives at the apartment, he doesn't have anything with him, but when Monica says goodnight to him at the door, he is carrying an umbrella.
Correction: If you look real carefully [and well, try slow-motion it] when Allan arrives he indeed has an umbrella on his right hand, the camera shot just shows a bit of it, but you can actually see it there, so him carrying an umbrella when leaving is not a mistake, because he took it in with him when he arrived.
Corrected entry: Joey is shown moving into Chandler's apartment and meeting everyone for the first time approximately one year before Rachel showed up. It is also mentioned that it is a warm time of year, indicating that it is set during the summer months. However in 'The One with All the Thanksgivings' (series 6) Joey is shown living with the Friends by Thanksgiving (i.e. November) 1992.
Correction: This entry corrects itself: Joey is shown living there BY Thanksgiving.... so he moved in during the prior summer.
Corrected entry: When Rachel is getting rid of her date to go inside and console a depressed Ross, you can see a crew member just as she opens the door when she goes back inside. That's neither Chandler nor Joey since Ross was just sitting there alone.
Correction: There is no-one else there, except Ross in the background. What you see is maybe his shirt, but nothing else.
Corrected entry: When Phoebe is reading Joey's interview in the soap magazine, her earrings change colour from red to yellow in between shots.
Correction: Actually, in some shots you can clearly see that the inside of the earrings are yellow and the outside is red so it is not a mistake.
Corrected entry: When Rachel arrives to Central Perk, Monica introduces her to everybody, including to Chandler, as if they don't know each other. In later episodes, we learn that Chandler, Monica and Rachel knew each other in high school. Even Chandler kissed Rachel once, and since Chandler always says that he hasn't kissed many women, he should have perfectly remembered Rachel, and Monica should have known that the two of them knew each other.
Correction: Actually, Chandler did not go to Lincoln High. He was with Ross in college. Yes, he met Rachel before, but Monica not remembering that is an understandable minor character mistake, not a movie mistake.
Corrected entry: In Season 2 Episode 1 'TOW Ross' New Girlfriend' Joey is talking about how his tailor did his first pants when he was either 15 or 16. He wasn't sure and said 'When was 1990?' Indicating that he was 15 or 16 in 1990. In Season 6 Episode 19 'TOW Joey's Fridge' It was revealed that in 1981 Joey was 13. Which means that Joey was born in 1968. If Joey was born in 1968, then in 1990 he was 22.
Correction: He never says that in 1990 he was 16. He was asking when was 1990 to have a time reference, and then calculate when the event happened in relation to that.
Corrected entry: Even though Chandler and Phoebe say they don't really watch the football game, it seems as though they agree that Detroit Lions won the game. But the 2001 Thanksgiving Day game between the Lions and the Packers were indeed won by the Packers.
Correction: You missed the whole point - they say they don't watch the game and then they guessed the wrong winning team.
Corrected entry: Phoebe says that her Grandma gave the cookie recipe to her 'on her deathbed', yet in series 5 Phoebe says that her grandmother died suddenly on a shopping trip, rather than from a long illness or old age as she suggests.
Correction: People generally have two grandmothers.
Corrected entry: At the point where Monica Geller shows Joey the DVD, it's not a DVD but a board to show Matt Leblanc his lines (note him moving his eyebrows).
Correction: Conjecture. Joey is a "dim bulb" and he is reacting to the situation. There is no indication that Matt LeBlanc would need cheatsheets to remember his lines.
Corrected entry: When Monica Geller tries to get a rematch on the race, Chandler Bing says they left -- but no door sound was heard.
Correction: Just because you don't hear a door close doesn't mean it didn't. They were playing a game and cheering and carrying on so it is perfectly conceivable that people could leave without being noticed.
Corrected entry: In episode 8.15, Phoebe accepts saltwater taffy treats from Ross saying she has never eaten them before when in episode 2.23, she mentioned that her then boyfriend, Ryan, a guy who is in the navy, gave her saltwater taffy for playing her guitar because he didn't have any change.
Correction: That doesn't mean she ate it. I wouldn't eat a piece of candy some stranger put in my bag.