I was thinking Pitt would of been smelled out right away and shot on sight in reality if one of the loyal Vichy exchanged more than a couple of words with him?
Quite true. But after all, it's just a movie.
This reminds me of the movie "Die Hard". I read an article about it yesterday where director John McTiernan mentioned being very frustrated with actor Alan Rickman's inability to speak a credible 'American' accent in regards to the scene where he comes face-to-face with John McLane and tries to pass himself off as someone who escaped being caught by the terrorists. McTiernan said he had to go through take after take of that scene since he kept detecting a british accent in Rickman's speech and that someone like McLane wouldn't have believed him because his 'American' accent still sounded too british. What McTiernan now finds amazing is that although he now regards Rickman as an absolutely terrific character actor, he was unable to nail an American accent on his first movie.
I watched that scene again earlier today and the director is absolutely correct: Rickman's American accent was definitely not a very good one.