Ariana Grande and Jennette McCurdy share the same birthday, June 26.
Mr. Purples, the stuffed purple giraffe that we clearly see in Cat's bike basket, appeared various times on Victorious.
Although many fans thought that Sam & Cat actually met in a previous episode of Victorious (iParty with Victorious), the real answer is that they never really met. Yes, they appeared in the same episode but never actually interacted.
The lid of the trash can Cat goes into was not supposed to fall off completely, but it did every time, so they kept it in.
The original opening scene of the show, actually included Sam rescuing Cat from mean girls who try to steal her bike. Dan Schneider (the creator and writer of the show) actually planned that scene until few days before shooting, where he came up with the garbage rescue idea - which later he liked better.