Continuity mistake: When Phoebe is left alone at the couch, her mom comes up to talk to her. Before her mom shows up, there is a water bottle in front of Phoebe. After Phoebe's mom sits down next to her, the water bottle moves to the other side of the table without anyone touching it.
Continuity mistake: When Max is ready to tell the family that he isn't the vandal, the grill is upside-down. Also, when Barb asks if the family if they wanted egg kabob their family picture is upside-down. When Max is grounded in his room, his Dark Mayhem poster is upside-down. When the TV says that the angry mob is approaching it's upside-down also when the angry mob is inside the house the penguin butler statue can be seen upside down This happens a few more times throughout the episode.
Continuity mistake: When Max and his band are at Splat Burger in the beginning, the table that the band is sitting at changes. When Max introduces the band to Wolfgang, they are sitting at a booth near the door. When Max gets up to play his song, they are sitting at a booth in the middle of the restaurant. When Max is covered in tomatoes, the band is at the booth by the door again.