Strange happenings in this film (spoilers)

Shooting your brother in the leg?
Doing surgery on the spot with a penknife?
No anaesthetic and yet no screaming?
No attempts to sterilize the knife?
Burning a perfectly wonderful ship model for no good reason?
Fifteen years later, still in Britain, but now have an American accent?
Being around 25, but looking more like 40?
People hiding behind fort crenelations are easily shot by men riding by?
Burning an entire desert fort for no good reason?