When Rocky gets ready to leave he changes his mind when he opens the door and sees his father's car pulling up on the other side of the street out front. However from his perspective he should see the gate and fence that's in front of their house and it's completely clear.
When Gomez unlocks Rocky from the pillory the chain is too loose to have held him in.
At one point Gomez refers to their pet lion, Kitty, as "she" even though the lion is male with a massive mane.