While Albert Johnson is making his escape through the forest, a modern highway guardrail appears clearly in the background. These guardrails were not in use during the time of this story, and Johnson was supposed to be out in the wilderness.
When Johnson is trapped on the cliff and begins preparing to jump into the pine trees, the weather is sunny and there is no snow on the trees. Yet when he jumps, the sky is overcast and the trees are covered with snow; once he is back on the ground, it is sunny again and the snow is gone from the trees.
When Millen takes his revolver out of the suitcase he opens it and you can see that it is loaded. Then he closes it and without cocking it he sights along the gun. You then hear the sound of a cocked gun being dry fired, even though the gun was not cocked and was loaded.