Some would say a "movie" is more populist fare while a "film" has artful aspirations. I think this distinction is silly. They both mean the same thing.
5. "Interchangeable but I sometimes use them distinctly" In response to Reply # 0
As in, "Listen, Jurassic Park is a legitimately great film, Jurassic World is a Fast and the Furious type action movie." It just kind of gives the former film more gravitas when I'm trying to explain what someone should expect.
That being said, if someone said, "I saw a film last night; Jurassic World." I wouldn't be a turd and say, "Actually, that's more of a movie."