When Winnetou gets out of the river, he is soaking wet, but seconds late when he gets on his horse, he is totally dry.
Old Surehand pops off several rounds at the guys on the foot bridge without levering additional rounds into the firing chamber. No levering/cocking sound at all, just repeated shots. The sound effects would work with a pistol, but not a rifle.
"Rampage at Apache Wells" - it's a catchy name, but the movie supposedly takes place in Utah, and Apache territory was well south of there. Apaches never occupied lands north of the deserts of the Mexican border states (of today's geography), nor did their close relatives the Navajo, who are also referenced in this movie.