Continuity mistake: At the end of the first attack by the destroyer - where she misses the U-boat and throws her bombs further away - the boatswain makes 22, then 23 strokes on the slate of the Control Centre,thus counting the number of depth charges used against the boat. A few seconds later, in a shot from another angle, with the slate in full view, we see only 22 strokes. (01:03:30)

Das Boot (1981)
1 continuity mistake
Directed by: Wolfgang Petersen
Starring: Jurgen Prochnow, Herbert Gronemeyer, Hubertus Bengsch, Klaus Wennemann
Other mistake: When attacking the convoy, the crew rushes forward during the crash dive. Just after a crew member jumps through the hatch after the bow crew compartment, you see someone standing still a second before getting pushed in the view of the camera. (01:31:15)
2nd Lieutenant: First time on U-boat?
Lt. Werner: Yeah. First time. It's gonna be exciting.
2nd Lieutenant: Do you have a will?
Lt. Werner: Excuse Me?
2nd Lieutenant: 13 boats down last moth. Sank with men and mice. Exciting, huh?
Trivia: The movie is based on actual events and some of the characters have existed in real life. One of them, Pilgrim, took his own life after the book on which the movie is based was released.
Question: During the film one of the officers was holding a bottle of Becks beer. Was the label on the bottle age/era appropriate?
Answer: The label is absolutely correct, but at this time Beck's Beer was only for export and not regularly available in Germany.
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Answer: I compared a clip of the scene to a vintage postcard from 1940 which had a photo of a bottle of Beck's, and it looks completely accurate in the film as far as I can see regarding the label, foil on the neck and bottle shape of the 1940s.
Sierra1