Corrected entry: The basis of the film is that the bad assistant mayor of Zootopia is involved in making predators revert to their natural character (as the film says "in their DNA") and attack "prey" citizens. One of the animals that was reverted and attacked another animal (a jaguar) was an otter (Emmett). An otter has no predator DNA to revert back to.
Corrected entry: When Judy is performing her play about how you can be whatever you want to be, the ketchup from the stage disappears.
Corrected entry: At the start of the movie, the train that Judy goes on and get off is different, for example, check the doors of the train. (00:09:20)