When Leslie puts up the "Safe Parks Now" poster she first places it at an angle. In the rest of the scene it changes from straight to crooked multiple times. This continues for the entire scene.
When Leslie, Tom and Jerry are meeting Carl in the park, the opening shot shows a boy in a blue T-shirt in front of a snack stand. In the next shot, he is wearing a hoodie.
In the home movie, Jerry is shown using his right arm to eat his burrito, seconds after he's supposed to have dislocated his shoulder. If he really had just dislocated his arm, he wouldn't be able to raise it, let alone eat with it.
Many of the outdoor scenes with vehicles show standard Indiana license plates on the front of the vehicles, while in fact, Indiana does not require front license plates, only rear-facing ones.