The One With Chandler's Dad - S7-E22
Corrected entry: Joey walks into the coffee shop and says "Hey Pheebs." It's Ross' voice dubbed over, not Joey's.
The One With Ross's Wedding, part 1 - S4-E23
Corrected entry: Emily, Ross and Monica walk past a black door, the shot changes to in front of them and back. When it goes back, the door is now a cream colour. (00:05:20)
Correction: None of the doors they pass are "cream colour" - every door they pass is black. It's all the window and door trim that are cream.
The One Where Chandler Crosses The Line - S4-E7
Corrected entry: Towards the end of the episode, when Chandler comes into the apartment to talk to Joey about his kiss with Kathy, Joey turns the TV off and places the remote on the counter. However, the TV is suddenly back on after Joey asks, "Is that why you bought all this stuff?" (referring to the furniture), and then Joey turns it off again manually. (00:17:10)
Correction: When Joey uses the remote he only mutes the TV's sound, and in the widescreen version we can see that "Wonder Woman" is still playing on the TV, then later Joey turns off the TV manually.
Corrected entry: At the very end when Joey breaks down the door, what looks like a stage curtain blows into the shot. (00:20:55)
Correction: That's not a curtain on the soundstage, it's actually the tablecloth on the side table - it's white with green pattern and trim. It's also visible earlier in the episode.
The One With The Mugging - S9-E15
Corrected entry: Phoebe realises that she was the girl who mugged Ross when he was 14. This cannot be true when all throughout the whole show Ross says that he and Monica grew up in Long Island and he moved to NYC for college.
Corrected entry: The color of the keys laid down at the end of the episode by each friend corresponds to the colored dots between the letters in the Friends title (red, yellow, and blue).
Correction: The keys are in fact (in no particular order) : purple, blue, black, red, bronze, and bronze.
The One With The Nap Partners - S7-E6
Corrected entry: When Ross and Joey are auditioning for Monica's maid of honour, Rachel says she met Monica when they were 6 and she met Chandler when he was 25, but in other episodes it shows that they had been to thanksgiving dinners together when Chandler was in college with Ross. In another episode it also shows Chandler and Rachel making out at a party, so she had met him plenty of times before he was 25.
The One With All The Haste - S4-E19
Corrected entry: In this episode the chain on Rachel and Monica's apartment door is very long, but in "The One With The Late Thanksgiving" in Season 10, the chain is much shorter, causing Joey to get his head stuck.
The One With The Football - S3-E9
Corrected entry: When Monica and Ross are discussing why they are not allowed to play football, Monica states in the story that they were both 6. This would imply they are either twins or at least the same age. However, we see that Ross is in fact older than Monica. Also, later in the scene Monica and Ross say the football incident occurred 12 years ago. This would mean that they are both currently 18 years old which is false. In one episode earlier in the season Monica states that she is 28 years old. (00:02:20 - 00:04:10)
Correction: She doesn't say they were both six, she says the event happened in "Gellerbowl 6", ie. the 6th year of the "Gellerbowl".
The One Where the Monkey Gets Away - S1-E19
Corrected entry: Monica tells the guys that she and Phoebe will search the third and fourth floors for the monkey and the guys would search the first and second floors. But Monica and Phoebe knock on Mr. Heckles' door, #9, which would be on one of the lower floors.
Correction: It is impossible to know how many apartments are on each level. It is likely that Monica and Phoebe are searching on the third floor at that very moment, meaning they could be on a floor lower than theirs.
The One With Joey's Fridge - S6-E19
Corrected entry: When Rachel refuses the two guys she is offered, when she is about to storm out then asks the guy about his hair, the shot changes. Between these shots, Phoebe simply disappears from beside Monica and Chandler. (00:18:10)
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.
The One Where No One's Ready - S3-E2
Corrected entry: When Phoebe asks Monica what gets out hummus, Monica comes out of her bedroom. In the wide shot she's standing next to Ross, in the closeup he's suddenly holding her by the arm. (00:05:55)
The One With The Ball - S5-E21
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. (00:12:00)
Correction: I just watched this episode, and you can actually see her move her hand from the cat to the pillow and back again.
The One Where Chandler Can't Cry - S6-E14
Corrected entry: When Chandler first reveals that he doesn't cry they are watching ET. The TV manages to turn off without anyone switching it off.
The One With All The Kissing - S5-E2
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. (00:00:55)
The One with the Thumb - S1-E3
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.
The One With All The Thanksgivings - S5-E8
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.
The One With All The Kissing - S5-E2
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.
The One Where Dr. Ramoray Dies - S2-E18
Corrected entry: When Phoebe is reading Joey's interview in the soap magazine, her earrings change colour from red to yellow in between shots. (00:07:00)
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.
Correction: I just watched this scene and I'm not sure how anyone could possibly think it is Ross' voice dubbed over. It is Joey's voice.