Jack Cassidy is the father of future teen idol David Cassidy who is best known for The Partridge Family (1970). George Dolenz is the father of future teen idol Micky Dolenz who is best known for The Monkees (1965).
Gareth Lowell's car is a BMW 503 convertible--a much rarer and more expensive car. Only 139 were made from 1956 to 1959. In 2021, an example of this car in excellent condition could be worth $500,000 or more.
At start of movie where Jack Cassidy drives up and "Craig" is dropping off roof is at 7751 Melvin Ave. Alley scenes where Craig is being chased are both North and South of Ingomar between Corbin and Bothwell.