Old Shatterhand steps into the canoe in boots, but as soon as he sits in, he is barefoot... And although Old Shatterhand is sitting completely in the wet, the water stain on his shirt gets smaller and smaller instead of bigger.
The rope Lex Barker is tied with on the "torture tree" changes positions between shots.
When Old Shatterhand and the coachman jump on the Horsebacks, the coachman loses his hat. After the shot changes his hat is back.
Old Shatterhand's top shirt button opens by itself.
Falling back, the villain's leg hits the bar lamp - which hangs completely motionless from the ceiling in the next shot.
When the Kiowas ambush the dynamite coach, some of them climb on it before it explodes. The bodies that are flying through the air a moment later a clearly dummies.
When Santer falls to his death, you can see the rope to which the rogue is attached, and just before that even the additional guide rope.
As Tangua and his people storm into the Saloon, the person watching gets a brief look at the street, where he can clearly see that it's a painted backdrop, e.g. the people on the street don't move.