Yeah you can turn your head but if I remember correctly some of the camera shots are from the dudes side, plus I think other people held the camera during the movie. But I may be wrong, been a whole since I saw it. When I think "first person movie" I'm thinking like a fps type game view the entire time.
I've always been fascinated with the idea of making a first person animated film. Working on my art skills to get to a point where I feel like they would be decent enough to even try that, but maybe one day I will.