Continuity mistake: In the cafeteria, when Oliver joins Miley and Lilly at the table the food and trays change position, particularly the milk carton. Then when Oliver stands up and announces that Lilly has the two tickets, suddenly the apple has changed trays and the juice box and milk carton are lying flat.
Continuity mistake: After Maddie tells Robbie Ray that her mother will be happy to learn he's alive, Miley tells her to take some of the happy and put it over by the suitcase, at which point we see the suitcase is zipped up, but in previous and following shots it's unzipped.
Continuity mistake: Miley has to hide all of the newspapers under her sofa, because they have the bad Hannah headlines on them. We see a lot of the papers fall out from under the sofa, but when Lily comes in, the papers that fell on the floor are gone.
Plot hole: Throughout the show everyone says that the TV show, in which Amber and Hannah are to be performing, is going to take place on Saturday night. It is mentioned three or four times. But, after the show, Amber enters the cafeteria and says, "Last night, I was on Singing With the Stars." If the show was on Saturday, they wouldn't have been at school the next day, which was Sunday.