Because of how much of the budget went to recording new songs and building new sets, cast members would have to wear the same clothes in more than one episode. Sometimes even episodes back to back.
Hollywood Arts High School is actually Burbank High School, which is located 15 minutes away from the Victorious set.
In the Asphalt Cafe, there's a green brick wall with a bunch of signatures on it. Those signatures belong to the cast and crew.
Even though Matt Bennett didn't voice Rex starting in season 2 he moved his lips a little to make people think he voiced Rex.
Victoria Justice, Leon Thomas III, Matt Bennett, and Elizabeth Gillies are the only ones to appear in all of the episodes.