Paul is just one more example of that classic genre, the spoofy, vulgar-funny alien and buddies on a road trip film. Well, it ought to be a genre.
Only a sci-fi film fan can appreciate this film properly, can catch all the Star Wars or Aliens or Close Encounters of the Third Kind quotes... but if you can, it's a lot of silly fun. (Too potty-mouthed for young kids.) Here's a link to Paul's film trailer.