This slip-up occurs in the scene in the movie where Art is eating breakfast with Ray Peterson after Art was shooting the crows. Art goes into the fridge and gets a bunch of food including a pineapple and something in a tin or wrapped in tin foil (don't remember exactly). He puts it all under one arm, the camera shot changes when Art leans down to talk to Ray and so does the arrangement of the food. When Art leans back up, the food once again gets rearranged.