Corrected entry: Towards the start, when Chandler, Monica and Phoebe are listening through the walls, when they are listening to Rachel and Joey, and the camera slides "through" one room to another, you can see Phoebe's hand in front of the wall section that is in between the two rooms.
Corrected entry: In Rachel's hotel room, there is a door on the left of the wall that joins onto Monica and Chandler's room. Due to the layout of the rooms, the only place it could lead to is Monica and Chandler's room. However, when Ross is talking to Rachel and she's looking for Joey, she walks through this door and has a quick look around. Surely she would see Joey in there, or at least Monica, Chandler and Phoebe and ask if they knew where Joey was?
Corrected entry: When packing up the spare room in Monica and Chandler's apartment, the boys find a pair of fluffy handcuffs in the wardrobe. Monica and Chandler painted the room and inside the wardrobe when Rachel moved out; wouldn't they have found them then?
Corrected entry: Joey can read Phoebe's mind! Joey asks for the phone number of Phoebe's friend. Phoebe gives Joey a pen. He writes the name of the girlfriend on his hand and gives the pen back. Phoebe never tells him the phone number.A couple of scenes later, Joey is having dinner with that girl.
Corrected entry: When Phoebe tells Monica and Chandler that Rachel and Joey are kissing in the next room, at the time she says "It's Rachel and Joey.", you can see that the door leading to their room has been partially cut to achieve the effect of the camera going through the wall. (00:01:40)
Corrected entry: The whole plot line of Rachel getting off the plane is most definitely impossible in post-9/11 America. Regulations consider any passengers that get off the plane after they've boarded to be security risks. When Phoebe gets Rachel talking about something wrong with the plane, causing panic, all those panicked passengers would have been stopped, and Rachel likely would have been questioned for the suspicious nature of that phone conversation. Likewise, when Rachel goes running off the plane, she at best would have been forcibly stopped and questioned, and at worst would have been shot, like the mentally ill guy in Miami in early 2006.
Corrected entry: When Ross walks into Monica and Chandler's hotel room, he is packed much earlier than both Monica and Chandler. However, in the episode after Monica and Chandler get married, Ross only signs out of the hotel a few minutes before check-out time. This is also implied by other characters who say that he does that all the time.
Corrected entry: In 10-9, The One With The Birth Mother, Erika hands Monica and Chandler a sonagram picture. Would they not see that she is carrying two babies on the sonagram? In the episode where Erika is giving birth, neither she nor Monica nor Chandler know that she is expecting twins.