When Sikowitz comes into the Black-Box Theater to check everything off, you can see Tori fixing a purple curtain around the Turblow Jet. The moment it cuts to Beck standing next to the Turblow Jet, the curtain is gone.
During the scene where André, Cat, Robbie, and Tori are eating lunch outside, the sleeves of Cat's cardigan are seen covering her shoulders and then after a perspective change slipped down to her elbows, then back again, without her physically pulling them up/pushing them down.
In the episode "Cat's New Boyfriend", Cat & Tori come across the same doctor as in this episode, and the lady at the desk is the same nurse as the one in this episode, so how come they didn't recognise everyone in Rex Dies?
When Cat first goes into the room at the mental ward, there's a little stool in the middle. Then later, when they cut back to Cat, the stool is gone and she's sitting on the floor.
A full jar of cream wouldn't make a full jar of butter. It would take a few gallons to make a full jar.
If Cat had actually sprayed something inside André's eyes, he could have been permanently blinded.
During the scene where André, Cat, Robbie, and Tori are eating lunch outside, after Cat exclaims that "Realio Dealio" is Spanish for "real deal", Trina says, "Do me a "flavor" and put Mom's credit card back in her purse." She accidentaly said "flavor" instead of "favor".
Cat somehow gets out of the medical room. Who would've let her out?