The photograph of Cunningham that Kelly pulls out of her bag to show the bartender differs from the one he's shown holding in close up. One has Cunningham facing right and the other has him facing left.
When Sabrina is following moving truck to warehouse, her Ford Pinto changes from having a sunroof to no sunroof multiple times.
Just after the ice cream truck smashes a cooler Jill skateboards down a small hill. The film magazine of a camera taking close ups is visible just over the top of a trash can as she passes.