When Michel is teaching Paulette prayers, his father boxes his right ear which Michel starts to rub with his right hand. In the close up, Michel is rubbing his left ear with his left hand, and in the next distant shot he's again rubbing his right ear with his right hand.
Paulette's mother can be seen moving after she has supposedly been killed in the bombing. The movements are especially noticeable in the closeups.
Father Dolle drinks the same glass of wine twice, or does not pour the second glass. The level of wine in the bottle does not appear to change.
The poor parents are killed by a Focke-Wulf 190. This kind of plane didn't exist at the moment of the "battle of France" in May and June 1940.