In the climax of Inglorious Basterds, Marcel lights the pile of nitrate film while standing behind the screen, which sets the place on fire and since the cinema doors are barred, everyone who doesn't get shot by the Basterds gets burned to death.
The only way I can see Marcel surviving is if there was a back door behind the screen and he went through it (and barred it) but far as I can recall the movie doesn't show this.
Is there anything to suggest that Marcel survived the fire by escaping? Or what the actual plan was? When he leaves Shosanna she's holding back tears, is it because she knows there's a very real chance that something could go wrong and this would be the last time they see each other, or is it because she knows that she's going to perish in the fire (and maybe Marcel will too) because one way or another this is a suicide mission?