I love movie mistakes. Here is my favorite .


When Dobby visits Harry in the hospital, he bashes himself on the head with the bottle of Skele-Gro. Before disappearing, he puts the bottle down on the table at the foot of the bed. After he disappears and the shot changes, the bottle is back in its original place on the side-table at the head of the bed; the table at the foot of the bed is empty.