Continuity mistake: In this scene we see Laura shot by a arrow. The arrow hits her in the right upper chest just below the neck. In the next shot they cut out the arrow and it's very clear the arrow has moved to the top of the right shoulder near the collar bone.
The chairlift for the ski resort on Mount Hood is visible in the scene that pans to the right just before James Stewart is abandoned on the mountain. This ski resort was not around when the film is set.