At the zoo, the position of the lions changes at the different camera angles.
Joe enters Roberta's bedroom at the lodge to discuss Frank's hunting rifle. When he sits down on the bed, the dog is directly facing him. When the camera angle changes, the dog is facing the opposite direction and staring at Roberta.
In the opening scene at the shooting gallery, the attendant fumbles with the revolver but is unable to reload it because he is pulling rearward on the release lever instead of upward. Reloading would be second nature to a shooting gallery attendant.