Revealing mistake: When Buck gallops away from Mano and the newly-rescued Sarah, two jet contrails are visible in the sky at the upper left of the screen.
Continuity mistake: At the end, Sarah leaps onto a horse, jumps the fence and rejoins the waiting Apaches. On the way, in between shots, her long green dress, which has been bunched up beneath her during the fence leap, neatly rearranges itself and drapes quite prettily over the horse on all sides, even though she hasn't had time to touch it.