When Cassie gives out all the cupcakes to the cast/crew on the set (about 1/2 way into the movie), she then walks up to Alex and Zack with an empty cupcake carrier to talk to them. When she finishes the conversation, she leaves with a full cupcake carrier.
(at around 1h 40 mins) When Skylar comes into the hotel room to rehearse with Alex, he is sitting on the bureau and his back is up against the center of the mirror. When the camera angle shifts he is suddenly sitting completely to the left of the mirror.
In the last half hour of the movie, Tricia tells a mob of people the Cupcakery is closed, shuts the door & sits on the couch. Cassie comes out to join her & she's wearing oven mitts, carrying a tray of cupcakes with a dish towel underneath . As Cassie sits down, she places tray on her bare legs, pulls the dish towel out from underneath, all the while wearing oven mitts to portray pan was hot.
In one of the online posts, Skylar's name is misspelled Sklar.
Alex's surname is interchangeably spelled Gray and Grey.