Revealing mistake: In one scene just before the attack on a big Hunter the young captain (Jürgen Prochnow) is sitting with his charts. Beside him he has got a glass of beer standing. The sub lurches heavily right and left in the hard weather, but the surface of the liquid stays the same.

Das Boot (1981)
1 revealing mistake
Directed by: Wolfgang Petersen
Starring: Herbert Gronemeyer, Hubertus Bengsch, Jurgen Prochnow, 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)
Captain: April fool. Practice makes perfect.
Trivia: The full sized mock up of the U boat was rented by Steven Spielberg for use in the first Indiana Jone's film.
Question: What's the music the German band are playing at the end when U96 returns to port?
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Answer: It's the 'Erzherzog Albrecht Marsch', composed 1887.