When Dawson is coming down the stairs to talk to his parents in the living room, Gale and Mitch fully change their position in the couch between shots.
Over the course of the episode, Jack's sling for his dislocated shoulder is on the left arm, then the right, then back on the left.
When Dawson and Gretchen are talking on the bridge, the same two couples keep walking by in the background several times.
Jack says he is 18, which given how early it is in his senior year, would make him one year older than the rest of the main characters, though it is never made clear why he was in the same grade as his sister.
When Dawson's father Mitch says 'Did you know your mother and I tried for 3 years to have you?"
Yet in fact he had asked Dawson this exact question on the football field, a season earlier.