Continuity mistake: When Courtney takes the knife off Michael that he is using to ice the cake, the close up shows her taking some cream off the knife with the finger that is on her left hand but when she puts it up to her mouth the cream and the knife has switched hands and also there is twice as much cream on the knife.
Continuity mistake: In the scene where Kyle and Tess are sitting on her bed and talking, she leans forward and hugs him by putting her arms around his neck. The shot then changes to his face and her arms are around the tops of his shoulders. When the shot changes back to her face again, her arms are around his neck again.
Revealing mistake: At the end of the episode, Courtney asks Maria to cover her for a bathroom break, as the Crashdown is full of customers. She goes straight into the Crashdown bathroom, which is right there by the entrance to the kitchen. After she gets through, she walks back out, but you can tell that she's walking out onto a soundstage - there's no other part of the Crashdown outside of the bathroom as she exits.