The department store Granny visits, changes from Lacy's to J.C. Denny's, and then back to Lacy's.
Just before Sylvester uses the fishing pole to try to grab Granny's hat, the address on the building is 163. The next building then shows an address of 156. The addresses should be all odd numbers or all even numbers if they are on the same side of the street.
The sunroof on the cab's roof that Sylvester goes thru to grab Tweety bird disappears after he hits his head on the Holland tunnel bridge.