Continuity mistake: At the start of the song "Chillin' Like a Villain," Evie's shoes go from having high block heels to entirely different shorter wedge heels during the song. After the song, it's back to the high block heels. (00:38:20 - 00:39:40)
Plot hole: When and how does Uma put a spell on Ben? She couldn't have when he was captured on the ship because she didn't have Mal's spell book at that point. Mal doesn't drop her spell book until after they rescue Ben and are on their way back to Auradon. Does Uma have powers of her own? So why would it matter if Uma got Mal's spell book?
Audio problem: When Evie is helping Mal with her outfit for Cotillion, Mal is talking about all the events coming up and says, "I can't remember what a single one of them is", although you can see Dove Cameron mouth the word "are" instead.
