Even though this is the third show of the season, this show was actually the first filmed for the fourth season (notice the new opening). CBS elected to air two earlier shows from season three that were never shown due to William Talman's firing.
The model courtroom credit opening first used in the second season episode, The Case of the Caretaker's Cat (1959), reappears in this episode and will be used for the remainder of the fourth season and all of the fifth season.
Referring to Perry's car in this episode, a 1960 Ford "Sunliner" makes its series debut. It is a two-door convertible. (Oddly, only Della is seen driving it.)