When Fonzie is talking to Pinky, his hair is covering part of his forehead. When she gets and leaves, and the camera pans back to Fonzie, his bangs are all combed back.
During Fonzie's first scene, his coveralls switch from being buttoned below to above his waistband.
A sign seen in the episode mentions "The Malachi Brothers". The episode credits have actor Michael Pataki playing one of those brothers and it's now spelled "Mallachi".
The episode takes place in 1957 or 1958, Pinkie's demolition derby car is a 1959 Chevrolet.