who was who?

I just watched the film, and I think I have a pretty good idea of what went on, so here goes (some spoilers ahead):

The guys on the boat were illegal immigrants. Judging from the credits, I'm assuming they are from Morocco. The guy who jumps in the vegetable truck is the same guy who, near the very end of the movie, is with his family and passes around the sand from their home country.

To my knowledge, the pickpocketer is just a pickpocketer, and the drunk guy is just a drunk guy. They don't pop up anywhere else except in their respective roles. As it shows one point later on in the film, the drunk guy is still where he crashed, alive and slow to get up.

The kid does not tell his mother because, in his imagination, he believes that the knocked-out drunk man really is the body of his dead father. He believes that he sees his father with a severe head wound, which plays on the coincidence that he gets headbutted by the pickpocket near the end of the film. Rather than saying that he saw a body at the side of the road, then, he says he saw his father's dead body, which leads his mother to believe that he is imagining things. Also, if the mother did go back to find the drunk guy by the side of the road, she would not be concerned about what her son said, concern which led her to call his phone and find that he isn't answering. It just happens to fit the plot.

The married guy doesn't leave his wife - at least, not during the film. The scene where they have a fight in the train station is actually just the scenario played out in his head, as are many other scenes where he appears to take action rather than sitting back and letting things happen to him by chance. The only scenes where he actually takes control of a situation is when he says he is going for cigarettes and instead escapes his mistress's parents' home, and when he grabs the pickpocketer's hand after imagining himself doing it a few times.

I realize this post is over a year old, but perhaps others will have the same or similar questions.

"Honestly, Trevor, if you were half a man you would've gone in there after the blender."