1.The first episode of Victorious was filmed on the which was also Victoria Justices 16th birthday.
2.Originally, series 3 and 4 was one series but they decided to split it as it was long and was going to be the last series.
3.When they were filming the last episode of season 4, they didn't know that it would be the last ever episode of Victorious ever filmed which is why it was a normal episode and there was no finale.
4.Ariana Grande and Liz Gillies knew each other before Victorious as they were in the Broadway musical "13"
5.Victoria Justice and Avan Jogia also knew each other before Victorious when they were in "spectacular".