When Tori and Jade sing "You'd be here and I'd be on a yacht, oh", in one shot, the guy who works at Nozu is facing the table and in the next shot, he is facing Tori and Jade with no time for him to turn around.
In class, when Cat and Robbie are about to tell bad news for the first time, the camera shows Rex in the background, the camera cuts back and Rex moves positions.
When the girls are at Nozu and they try to start talking to each other, the spoon Tori was using to eat her soup disappears, then it reappears again.
When Sikowitz is telling the girls about their date, you can see their glasses on the counter. After he introduces Burf, the glasses are missing, then reappear in a later shot.
[in a deleted scene] Robbie was said to have wet himself enough to make Rex's leg damp, but his pants were completely dry.
After Robbie and Cat play a song for Trina, she smashes the guitar Robbie was playing, however she is just carrying some random guitar parts back into the shot. That is really Matt Bennett's guitar and he is always really playing it in Victorious scenes, no overdubs.