Corrected entry: When Chandler and Phoebe go to the jewelry store Phoebe's hair has two braids on each side that are being held together by what appears to be a hair pin, later on the scene where Phoebe is trying on a tiara she only has one braid on each side and no hair pins.
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.so_random_girl
Corrected entry: In the scene where Rachel asks Phoebe if she can live with her Phoebe claims to have a roommate called Denise. However in a previous episode 'The one in Vegas part 1' Rachel and Phoebe are talking about walking around the apartment naked and Rachel says "you live on your own" to which Phoebe agrees saying "Yeah, why do you think it takes me so long to answer the door".
Corrected entry: At the end of the episode, Ross and Monica complain because they didn't get to perform their routine on the platform (because it cut to midnight too quickly). But the director must have known exactly when the filming would end, so why would he have put Ross and Monica on the platform 10 seconds before the end of filming? It's not just that he wants them in the background for a few seconds or something, because he wanted them for the blooper show (not the final show) and they didn't get a chance to dance up there at all.
Corrected entry: In this episode The One with Joey's Fridge, Rachel's hair is just a few inches past her shoulders and in the very next episode, The One with Mac and C. H. E. E. S. E. Rachel's hair has magically grown down to her waist. No one else's hair has changed, and no mention of it in these episodes either. I guess they were just hoping no one would notice it.
Corrected entry: When Paul is looking in the mirror and saying he's a sex machine, instead of looking at himself in the mirror, Paul is looking at the camera in the mirror. That's why his eyes in the mirror look to the front. This happens in many films and TV shows.
Corrected entry: When Rachel comes in to spy on Ross through Monica and Chandler's window we hear the shower water running and both Monica and Chandler are in the bathroom. However, Chandler comes out wearing a T-shirt under his robe (and he's wearing socks). This seems to assume that he is dry (as the T-shirt is dry too). Also we can see that Monica is wearing her nightdress under her robe when we see down to her feet, so how could one or both of them have been showering?
Corrected entry: When Rachel is looking for an apartment, Phoebe says she can stay with her because her roommate Denise will be gone until December 26th. But when the apartment burns down and they plan to move back in episode 10 of season 7, nobody cares that Denise would've been back a LONG time and also doesn't have an apartment, because Phoebe wants Rachel to move in with her.
Corrected entry: When Paul enters his bedroom and Ross is behind the door, Ross hesitates and then snakes under the bed while Paul is distracted. However, Paul is looking at the mirror in the corner, which faces back towards the door, so he should have seen Ross standing there.