Visible crew/equipment: In the scene outside of the Rialto, where Dawson is scolding Joey for being rude to Jen, Joey's shirt is falling off one shoulder. She shrugs to fix it, and her shirt lifts in the back, exposing her mic. (Time)

Deliberate "mistake": Throughout the first episode, Jen's bangs are long in scenes relating to her "Grams" and short in all other scenes. This is because the scenes involving her storyline with Grams was shot much later, after the show was picked up. (Time)