[Jean-Philipe]

There's a German black-and-white comedy "Die Feuerzangenbowle" from 1944 and most of the actors knew this was going to be their last film. They were drafted into the war right after filming wrapped up and all of them died, apart from the main star.

[agurk]

You may be thinking of a different film, as all the cast members listed on wikipedia[0] are stated to have died after 1945.

The trivia section of the German wiki page of the same film says there's a disputed rumour that the film was prolonged to help the young extras avoid conscription.

[0] https://en.wikipedia.org/wiki/Die_Feuerzangenbowle_(1944_fil...

[Jean-Philipe]

Thank you for pointing that out! I think that's the rumor I heard...