Goof: During Ross's keynote speech, the bearded extra sitting behind Charlie and Joey is chuckling and glancing over at Joey when Joey laughs about Ross saying Homo Erectus.
Goof: Rachel laughed the second time Ross said Homo Erectus, but not the first time as Joey did.
Goof: When Mike and Monica start playing Ping-Pong, a boom microphone is visible moving out of the top of the screen.
Goof: During the second set of the table tennis match between Monica and Mike, at the end of the set Mike places his non-racket playing hand on the table and should have forfeited the point. He pointed that out when Monica did so he was aware of the rule but no one spotted it.
Continuity: Joey says that he's "...curious as George", and Rachel asks who Curious George is. She should know. In Season 1's "The One with the Fake Monica", we learn that she had a Curious George doll (who wasn't as curious once Marcel got to him).
Continuity: Joey refers to his TV show as "The Days of Our Lives". Ross corrects him saying it is just "Days of Our Lives". Joey reacts as if Ross is messing with him. However, in Season 7's "The One with Joey's New Brain", Joey correctly refers to it as "Days of Our Lives", even using the acronym "DOOL" (which Monica picks up on). Of course, it's Joey, so it's conceivable that at some point he simply lost track.
Continuity: Charlie tells Joey that she doesn't even own a TV, and Ross suggests that TV has no real value for him, either. This is inconsistent with our knowledge of Ross. In "The One Without the Ski Trip" he's excited about the new home theatre system he's just bought. In "The One Where Eddie Moves In", he fights over the remote at Monica's, wanting to watch Predators of the Serengeti even though Monica wants to watch Entertainment Tonight. We know that he watches a lot of sports on television, shows like Behind the Music and the occasional adult video. When Rachel was staying with him she complained that he was always watching The Discovery Channel, including documentaries on The Black Plague and how they make saltwater taffy. In "The One on the Last Night", he even watched basketball with a fake, pumpkin-headed Ben. And we haven't even mentioned... Die Hard!!
Trivia: In this episode, Rachel has an unexplained bandage on her left forearm.
Continuity: Charlie suggests saving the cork from the bottle of champagne and refilling it with water so the hotel won't charge them, and Ross responds, "Oh my God, I love you". However, in "The One with Rachel's Dream", Ross goes to great lengths to explain to Chandler that you only take what the hotel provides for your use; to take anything else would be stealing.
Factual Error: Charlie says that the wet season in Barbados is from June to December. Actually, it is from June to October. As they say in Barbados, "June too soon, October all over!"
Goof: When Phoebe, Rachel, Chandler, and Monica arrive in Barbados, it is raining heavily, however, all of the friends enter the hotel completely dry and without umbrellas. Also, later when Mike arrives at the hotel, rain can be seen through the window behind Phoebe and David, but Mike is completely dry.
Note: It's entirely possible that they took a cab or ferry service from the airport and got out of the vehicle inside a covered entranceway (common to many hotels). When Monica and Chandler enter, for example, you can see that it is from a walled, dry walkway with the rain in the background.
Trivia: In this episode Rachel steals a name tag from the pharmacist convention with the name Kate Miller on it. Kate Miller was the name of Joey's love interest in Season 3, played by Dina Meyer.
Goof: When Ross gets stuck in the office, he calls Joey looking for Charlie, despite the fact that he saw Charlie leave the coffee house with Rachel to go shopping.
Goof: Zack asks Monica for a coaster. However, when he stands up to go to the bathroom, and the camera angle changes, his glass is on the table, not the coaster.
Trivia: At the end of the episode when Chandler is talking to Zack in his office, there is a frame in the hallway behind Chandler with the Japanese hiragana symbol. The Japanese symbol, "me", means sight, eye, viewpoint, or experience, which alludes to a motivational office slogan in this case.
Goof: When Monica, Chandler, and Zack are all eating dinner, Zack's fork is in his hand, then it's on the table, and then in his hand again.
Goof: When Ross was trying to get out of the room, he could have just walked around the front of the desk instead of trying to get past the professor.
Goof: How did Charlie not notice that Rachel said that she liked Joey, instead of Phoebe? Their voices are very different.
Continuity: While talking with Chandler and Ross in the coffeehouse about Chandler and Monica's inability to conceive, Joey mentions not knowing the meaning of surrogacy. This is very hard to believe, given that Phoebe was the surrogate for Frank Jr. and Alice's kids earlier in the series.
Trivia: The words Joey had memorized for Days of Our Lives, fronto-temporal-zygomatic craniotomy, actually refers to a craniotomy where a simple and safe procedure is performed without any instrumentation or plating techniques in which the dissection distance is shortened and there is a wider, shallower operating field. Joey believes it means someone gets attacked by a bear.