Jackson, a clerk and process server who appears in several Perry Mason novels, appears in just this one episode of the television series.
"Frank Maddox" (John Archer) puts 2 cigarettes in his mouth to light them for himself and "Doris Cole" (Hillary Brooke). His actions are an homage to Paul Henreid's actions in "Now, Voyager" (1942) when he used the suave move to light cigarettes for himself and Bette Davis.
Mason drives a 1957 Buick Special convertible. The three chrome-plated holes in its front fender identify it as being a six cylinder vehicle.
Hillary Brooke and John Archer would both pass away the same year (1999) and at the same age (84) as each other.
First of three episodes featuring Thomas Browne Henry, William Hopper's costar in 20 Million Miles to Earth (1957).