Admissions - S4-E17
Plot hole: When Pacey and Joey are unloading the groceries from the car for her party, Pacey makes a remark that he has to go to Joey's garage to get a dolly to haul in the charcoal. But Joey's house doesn't have a garage. During the entire series; there has never been a visible garage on their property, and the large blue truck is always parked out front in the open.
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.