In the scene where Davey runs from his house to the wasteground, chased by DS Cree and DC Feast, a distinctive red American car that has been converted into a towing truck is seen briefly. This car featured in another episode In from the Cold (1976): it was used to rip the doors off a prison van so as to secure Billy Medhurst's release.
The silver American car driven by Sheila Martin is a second generation AMC Javelin in AMX trim.
In the scene where Jack goes to see Don at the speedway track (White City), the two riders who are "doubling" for the characters are Trevor Geer and Paul Gachet.
Karl Howman (Davey Holmes) later appeared with Dennis Waterman in All About Scoring, Innit? (1980) and Minder on the Orient Express (1985)