Plot hole: The movie is allegedly set about ten years after the death of the German soldiers, since the daughter of one soldier is in her early teens. But none of the items in the scenery look like they're out of the fifties.
Zombie Lake (1981)
1 plot hole - chronological order
Directed by: Jean Rollin, Julian de Laserna
Starring: Antonio Mayans, Anouchka, Howard Vernon, Pierre-Marie Escourrou
Visible crew/equipment: When the woman in the opening credits is taking off her clothes, she is about to take a blue shirt from her bag, but decided against it. As she does, you can see a crew member aimlessly wandering around in the bushes behind her. (00:01:40)