Amos drops three traps on the ground by Copper. Yet, when he sets them up, we see five traps. Furthermore, Tod springs about half a dozen traps, and there is one left for Amos to accidentally step into.
At the start of the Winter Hunting scene, Copper can be seen hopping about in the snow making his own trail. In the immediate close up, he is suddenly hopping in Amos' footsteps and his previously made trail has gone.
In the scene following Chief's fall off the bridge Amos goes to the widow's house. When she answers the door her hair is visibly brown in color, in all the scenes before her hair is gray. This is most noticeable as soon as she closes the door from her confrontation with Amos and stands in front of the mirror. Her hair is again gray.
Early in the fight with the bear, Amos Slade lets off a gunshot that grazes the bear's arm. Later in the fight, Copper bites the bear's snout, which leaves several bite marks. Both the gunshot wound and bite marks have disappeared by the time Tod joins the skirmish.