Plot hole: After the first attack on the U96 the captain decides to resurface after sunset. However when they do resurface it's broad daylight.
Das Boot (1981)
1 plot hole
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)
Captain: April fool. Practice makes perfect.
Question: What's the music the German band are playing at the end when U96 returns to port?
Answer: It's the 'Erzherzog Albrecht Marsch', composed 1887.