Continuity mistake: When Mugsy takes Bugs into the other room, you can see the door has no handle, but when Rocky draws a gun and goes to see Bugs, a handle appears from nowhere.
Continuity mistake: At the beginning of the cartoon, you can see that Mugsy is bald, but when he pulls Bugs away from the telephone box, he now has hair under his hat.
Rocky: Stop right there, rabbit! How much do you know?
Bugs Bunny: Who, me? Oh, I know uh lotsa things! Two and two is four, Carson City is the capital of Nevada, uh, George Washington was the first president.
Rocky: CUT IT! This guy knows too much, Mugsy.