Factual error: This mistake is from series 6 onwards, with Ross' new apartment: There is an impossibility with Ross' kitchen, but not all of the time. It depends on the layout of the hallway outside his apartment. If the hallway continues along for a bit before going left or right, then the kitchen should stick out. However, when the hallway is a dead end, the kitchen fits ok.

Continuity: Joey's Hand moves from putting it to his mouth to the plate instantly at breakfast.

Continuity: When Ross and Rachel are in bed, and Rachel says she remembers laughing a lot, and Ross says "Then we didn't have sex," Rachel turns her head away from Ross twice.

Revealing: When driving back, the outside is obviously a projection.

Continuity: In the previous episode, Ross rings the helpline of the makers of the pen and is told the pen won't come off. Yet in this episode it vanishes from Ross and Rachel's faces between getting up and going to breakfast.

Revealing: At the very end when Joey breaks down the door, what looks like a stage curtain blows into the shot.

Continuity: During breakfast, when Joey and Phoebe are talking about driving back, the fork in Phoebe's left hand disappears and reappears.

Audio problem: Right after Ross and Rachel leave the wedding chapel, Joey and Phoebe rush in. Joey is saying "C'mon, Pheebs, hurry, hurry." and she is saying "Okay, okay." However, neither one is moving their lips.

Continuity: In the scene where Rachel is all happy that the three of them are going to live together, her arms keep changing position throughout the scene.

Continuity: When Monica and Chandler are eating, Monica's plate holds a sandwich and chips. When Joey comes in, Monica's plate contains no chips, and when he leaves the chips are back again.

Continuity: When Joey is interviewing the potential roommate and Chandler comes in, Joey's stance changes a few times. His grip on the application form changes, and when he points to the bathroom his arm is in a slightly, but noticeably, different place in the next shot.

Continuity: When Ross is talking to his divorce lawyer there are 2 pens in a holder on the desk. Throughout the scene they vanish and appear randomly.

Revealing: When Phoebe knocks over the vase she glances at it just before throwing the diaper.

Continuity: Phoebe knocks over a vase and has to clean it up because "Let's face it; we're at Monica's." When she turns back around and notices one of the babies is missing, the baby on the right (in the striped top) falls over towards the other baby. A split second later when the shot changes the baby is sitting upright again.

Visible crew/equipment: Anytime we see the Porsche, there is always a stage light above it.

Continuity: At the end when Monica and Chandler hug, Monica's arms keep going from under to over Chandler's arms as the cameras switch many times.

Continuity: When Phoebe is waiting for Rachel behind the tree a man wearing grey runs past (left to right). Then when Phoebe jumps out and is talking to Rachel about her fake sore leg, the man in grey runs past again.

Continuity: In the episode 'TOW Phoebe Runs' when Rachel runs into the horse at the end there is a shot of the horse looking round at her, when the shot changes angle to show Rachel picking herself up you can see that the horse is still looking straight ahead.

Continuity: In the opening coffee house scene Ross is holding a red folder, then it disappears and then he has it again.

Revealing: When Ross's date turns the lights down he can speak and yet the whiteness of his teeth doesn't show.