I enjoyed this one. The scenery was stunning and Corbucci aptly demonstrated his flair behind the camera once again.
However, aside from the band of hippies and the rather ludicrous bulletproof vest which have been mentioned by others, I really didn't like the way they pretended Mario Adorf was missing one of his arms from the elbow down by simply folding his arm up on itself. They should have at least padded out his other arm to make him look balanced.
I had no problems with Johnny Halliday in the lead role. This and Cemetery Without Crosses are the two SWs I like to watch in French to appreciate the original voices of the main actors.