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)
Corrected entry: When Monica shows Chandler the check from Pete, Chandler says, "Pete Becker, Pete," and he grabs a magazine from his briefcase, but before this Chandler told the girls that he hasn't been able to unlock the briefcase and he just carries it around, so how would Chandler have gotten it out?
Corrected entry: When Rachel is eating at the diner and she and Monica are talking, there is a red glass sitting in front of her. In the next shot she is talking to Mark and says "It's not funny!" and the glass is gone; in the shot after that it's back again.Pam-I-am
Corrected entry: In the flashback episode, Chandler and Monica are in the bar (which is soon to become Central Perk) and Rachel is in the same bar with her friends before she is due to marry Barry. When Chandler overhears Rachel - a complete stranger - say she wants one last fling, he tries to flirt with her, but she dismisses him. Monica then says "I know her" and talks to Rachel briefly with Chandler present.In fact, as revealed in later episodes, Chandler and Rachel knew each other when he was in college with Ross and Rachel was in high school with Monica - in fact they even made out at a college party.
Corrected entry: When the five of them are at the rest stop, Joey manages to get the cab door open. When Phoebe starts to reverse the car, you can tell the cab hasn't broke down as you can see the brake lights come on. No lights were on when the cab started moving. (00:11:10)
Corrected entry: Near the end when Chandler is in a meeting, Stevens comes back later because he forgot his suitcase. If you look carefully, he picks up his suitcase and then puts it back down on the table on purpose. Also, when he leaves the room, you can see him turn around and hide out of shot waiting for his cue to come back in. (00:20:15)