We watched the Argentinian horror movie Terrified last night. The movie wasn't very good, but it featured something that I don't think I've seen in many other movies, and now I'm looking for more examples.
The movie was made in Argentina and is entirely in Spanish. One of the characters in the movie was (probably?) supposed to be American (at one point he is introduced as having helped with similar hauntings in the United States). I don't speak Spanish but it was pretty clear that he was not a native speaker and didn't quite have the accent. This was just a part of his character, there was a moment in the movie where he is reaching for a word in Spanish and another character helps him.
It occurred to me that it is extremely commonplace in English-language movies to have characters from other countries who do not speak English fluently or speak it with a very heavy accent, but I'm having trouble thinking of more examples of foreign language films where an actor is a native English speaker acting in a second language. Obviously this is mostly because native English speakers are less likely to speak any other languages, but there must be more examples. Can you think of any?