In the scene where Pepe is painting a new name for the school over the original name-plaque the letters and the colourtype they are painted in change during the scene revealing at least one re-shot. The change is most obvious by looking at the last S from "NONSENS" at the beginning of the scene and near the end.
When Dr. Roland "accidentally" spills the contents of the suitcase of his friend Dr. Tell, he, Dr. Tell and Dr. Tell's wife are desperately trying to put them back in the suitcase. The position of Dr. Tells wife switches from crouching to kneeling and back to crouching depending on the camera-angle.
When Dr. Roland (now in his disguise as Dr. Tell) is hit by Pepe's sister with her car he wears almost black trousers. But when Pepe's sister stitches his trousers in next scene he is wearing notable brighter grey trousers.
During the physics experiment with the two electrical charged metal spheres the smaller sphere changes its position throughout the scene.