Plot hole: When everyone first shows up at the Airport, it's daytime and not too late. Joey then works an entire shift at the Capeside Yacht Club, probably through the dinner rush until later that night. When Joey and Pacey are talking on the dock after she is through working, it's late at night. They suddenly decide to rush to the Airport where they assume everyone is still waiting for their flights. Being as this must be several hours later since they all met at the Airport, would everyone's flights really be delayed that long? (00:30:05)
Continuity mistake: During the 'Urban Legend' that Pacey is telling everyone, he and his co-worker are being chased by an evil car. Right after they leave the creepy Diner, they come upon the enemy car facing them parked across the highway. Pacey slams to a stop, and they are facing the car head-on in very close proximity, right in front of them. But the next shot shows that same car much further away, down the road and Pacey hasn't moved yet.
Continuity mistake: When Pacey is handing Audrey the cupcake in the motel room, he places a small candle on it first. When he puts the candle on the cupcake, it's noticably crooked. But in the next shot showing the cupcake, the candle suddenly appears much straighter. (00:37:55)
Downtown Crossing (2) - S5-E15
Plot hole: When Joey suddenly regains consciousness in the ER, she is sitting upright on the end of a hospital bed or gurney. But this doesn't make logical sense, because if she were really unconscious she would be laying down. Yet it's made very clear in that shot, that she is opening her eyes for the first time after fainting and being unconscious.
Audio problem: When Charlie is trying to hit on Joey at the College Bar, she makes fun of him referring to him as the "Bass Player to take home to Mom" or something similar. However, when you see and hear Charlie playing in the band during that episode, it sounds like he is specifically playing either electric lead or electric rhythm or both, *not* bass.
Continuity mistake: In the intro to this episode, the camera is panning the family photos of Dawson and his family. There is a close-up of a photo of Dawson and his parents, and Gail has the really long 'big' hair she only wore in Season 1. At this time, Dawson looked much younger and had longish hair himself. But in the photo-Dawson has much shorter hair and looks older as in current time. Apparently the photos were put together just for this episode.
After Hours - S5-E21
Audio problem: Just after Audrey storms out of Pacey's apartment, after catching him with Alex; Pacey runs after her and they begin arguing in the street. Audrey makes a comment that 'it meant your arms around her, and HER tongue down YOUR throat' referring to The Kiss between Pacey and Alex. But then Pacey counters with 'well actually, it was HER tongue down MY throat' in sort of a comic way, as if he was correcting a backwards situation. But Audrey had just said the same thing! One of the Actors messed up their lines, probably Busy Phillips since Joshua Jackson seemed to have his lines correctly.
Answer: It's only explained once in the series. Jack says to Andie "I tried to start kindergarten without you", meaning Andie was smart enough to start school early.