Though it's mentioned that Potsie is 17 years-old and will be 22 years-old in five years, off-screen, Anson Williams was already 26 years-old when the episode aired.
The episode title is a takeoff on another Paul Anka song title: Puppy Love.
It's mentioned that Potsie is three years older than Joanie, however in reality, Anson Williams is eleven years older than Erin Moran.