During the scene where Sylvester, Tweety Bird and the dog are in the hospital with casts on their legs, the dog groans in pain before Sylvester smacks his leg with a club.
After the dog switches leg casts with Sylvester, he's not wearing the other leg cast he switched.
When Granny is at the front of the line Foghorn Leghorn is behind her, but when she approaches the well he is already there; leaving dissatisfied with his wish.