The first fighter Chachi faces is real life American boxer Sean O'Grady, whose career was winding down that year (1983). Sean's first couple of years of professional boxing he was an astounding 73-1 with 65 knockouts (24 in the first round) and a WBA World Championship Lightweight title. He was entered into the World Boxing Hall Of Fame about ten years later.
Chachi becomes the third person after Richie and Joanie that Fonzie has allowed to wear his iconic leather jacket.
Chachi's (Scott Baio) weight is twice given as 155 lbs. This would put him in the light middle weight boxing class.
This episode marks the first time that we actually see Fonzie hit someone.