Continuity: The writers of the show have commented on how Chandler and Rachel met for the first time on three separate occasions. They meet in this episode which occurs a year before the pilot episode, then again in "The One Where Monica Gets a Roommate (a.k.a. Pilot)", and then we learn in "The One with All the Thanksgivings" that they met while Chandler was still in college.
Continuity: In this episode Rachel tells Phoebe that she's not supposed to bring cups out of Central Perk. However, in "The One With The Baby On The Bus", not only does Phoebe drink from a cup outside of Central Perk, but Rachel brings it out for her. Also, in "The One With A Chick And A Duck" Gunther (who was actually the person to tell Rachel that the cups weren't supposed to be brought out of the coffee place) brings out a cup of cocoa for Rachel.
Goof: At the end of this episode when Chandler locks Joey inside the entertainment unit, he supposedly gives Joey a five dollar bill, confirmed when Joey says "Hello Mr. Lincoln!" However, when Chandler takes out the bill from his wallet, it is clearly a one dollar bill.
Continuity: Monica is obsessed with cleaning throughout the entire series. However in this episode, she never noticed her bathroom floor was dingy, even though Joey, of all people, did.
Goof: The gang realizes that the entertainment cabinet is too big for the wall after they lift it up, but it would have been obvious when it was still lying on the floor.
Goof: When Chandler trips over the bottom of his bedroom door after Joey saws through it, the part he trips over never moves. The bottom part should move because it is not latched to the door frame at all.
Goof: When Frank Jr. holds a white sheet around himself, while talking to Phoebe at the massage parlor, the gathered sheet in his hand keeps changing repeatedly throughout the scene.
Goof: When Phoebe is talking to Monica while Frank Jr. is doing karate on the balcony, the blue cup in front of her switches to the other side of her plate and then back when the camera angle changes.
Trivia: Chandler's door is never completely repaired or replaced following this episode. Although Monica adjoins the two halves in Season 4, Joey's cut is still visible for the remaining seven seasons.
Note: Monica doesn't join the two halves of the door in Season 4, neither does she even mention having done it. In episodes following her brief stay in the guys' apartment, the two halves can still be seen moving separately.
Continuity: Phoebe's birthday is inconsistent. In this episode, Phoebe tells her half-brother that her birthday is February 16th. Also, in "The One with Two Parts (2)" Phoebe has a birthday party in February. However, in "The One Where Nana Dies Twice" Rachel talks about Phoebe's last birthday party. Since Rachel first met Phoebe earlier that season, this implies that Phoebe's birthday must have occurred since September, when Rachel first joined the group. Also, in "The One with Phoebe's Birthday Dinner", Phoebe's birthday is close to Halloween, consistent with Rachel's statement. Furthermore, in "The One Where They All Turn Thirty", the flashbacks of Phoebe's 30th (really 31st) birthday imply her birthday is in the summer.
Continuity: When they show the inside of Monica's bathroom, the toilet is against the wall opposite the door. In "The One With Chandler And Monica's Wedding (1)" when Phoebe finds Rachel's pregnancy test, the toilet is right next to the sink.
Continuity: Phoebe (acting as his agent) tells Joey that he lost a part in a TV movie because "They'd never met an Italian actor with a worse Italian accent". However, in Season 7's "The One with Ross and Monica's Cousin", except for his missing "turtleneck", he nails the audition for an Italian immigrant. Apparently, he'd been "a-working onna you Italian accen-tay".
Goof: When Monica is telling Susan and Carol that Ross used to dress up as a girl, Ross goes over to the table and picks up a drink. When he picks it up it has the lid on. In the next shot he has the lid already in his hand.
Goof: When Ross shows G.I. Joe to Ben, the Barbie's legs are pointing towards the refrigerator. In the next shot, they are suddenly pointing the opposite way.
Goof: When Rachel and Monica are comforting Chandler and Rachel realizes that Chandler didn't call himself a loser, she pulls her hands in by her body. When the shot changes, her hands are back on the chair.
Continuity: Contrary to all descriptions of Monica's childhood weight problem, including an incident where they had to call sixth graders to teeter-totter with her when she was in kindergarten, young Monica in the home movie is of average weight for a child her age.
Goof: In the scene where Chandler is eating the soy-based ice cream, the label of the ice cream changes back and forth. At first, the label is green and white, and says "French Vanilla", the camera cuts away, goes back to Chandler, and then the ice cream bucket is solid purple. Afterwards, it switches two more times.