During the ambush shoot-out, Scarnes shoots McGuire's rifle stock. In subsequent scenes, the stock is intact.
After Marshal Dan Blaine unties Ernest Scarnes and sends him on his way, they both ride off in different directions, but the sun casts a shadow on each one's left side.
During the card game, there is a woman in a yellow dress watching on the far end of the table. Her right hand is alternately on her belly/at the top of her dress between shots.
When Lisa goes to the general store early in the film, her maid Sally has the basket on her arm and off between shots.
During the shoot-off with Scarnes and McGuire, McGuire gets off seven shots with his six shot revolver without reloading.
When Marshal Dan Blaine is fishing, the fish on his hook pulls a plastic bobber under the water. Plastic bobbers did not exist at the time this story takes place, so it should have been a cork bobber.
When Dan and Lisa go in her carriage to see Marie's new baby, there are tracks of modern pneumatic tires seen in the road behind them.