The front of the house appears to have a step in front of the door in some scenes and a flat sidewalk with no step in other scenes.
Bugs Bunny sets the carrot on the skewer down next to the fire.
It is gone in a later scene and then Bugs Bunny has it back in his hand again.
When the front door is visible from outside, the door has a handle with a thumb-latch. When the door is open and visible from the inside, it has a round knob on the outside side of the door.
When Bugs is reclining and drawing his hand, he is on Sylvester's green pad. There is a cut to Bugs checking on the old lady, then a cut back to Sylvester thawing out - but the green pad is gone.
The carrot incorrectly appears behind the flames of the fire in one scene.