Revealing mistake: When Col. Franz von Waldheim first encounters Mademoiselle Villard at the museum and walks away from her to turn on all the lights, the wall to the right bounces like canvas as he operates the switch.
The Train (1964)
1 revealing mistake - chronological order
Directed by: John Frankenheimer, Arthur Penn
Starring: Burt Lancaster, Paul Scofield, Jeanne Moreau, Suzanne Flon
Continuity mistake: In the train yard scene when Le Biche and Colonel Von Windheim are watching for the trains to switch to the right tracks a pipe is tossed onto a chair and tobacco spills out, but when the camera is panned away and comes back the tobacco is nowhere to be seen.
Papa Boule: Renoir... I knew a girl who modeled for Renoir... She smelled of paint.
Answer: In several location throughout France, from Paris to Mertz, with many scenes being filmed on location. You can find more details on IMDB or Wikipedia.
Bishop73