This was Disney's first animated feature to use computer graphics. Most of the CGI in this movie is shown during the scene where Amos traps Tod and Vixey in the burrow.
In the end when the Widow Tweed is wrapping Amos Slade's foot, the bandage is shown to be halfway up his foot. After she tweaks his toe, it shows the bandage to only be wound up to his ankle.
We see Amos walking with the traps over his shoulder. He's holding onto them with a leather strap. Yet, when he catches up to Copper, the strap is now a chain.
Big Mama: [to Tod]
Now, if you're so foxy, and old Chief's so dumb, then why does that hound get the fox on the run? 'Cause he's got the hunter, and the hunter's got the gun. Kablaam! Elimination. Lack of education.