Near the beginning when Wickie and the Eskimo-slaves are in the slave-carriage the carriage hits a tree-root the lantern at the back of the carriage falls off. In the next shot it is back in place.
Near the end, when Wickie has to find the entrance to the location of Thors hammer, he uses his bow to shoot the stones and relay the strings with a weight. The oscillation is physically impossible. Due to the length of the string the weight should less than a meter away from his feet.