One of the few "Perry Mason" television episodes where he used the bust by his office door as a hatstand, which seemed to be the reason for it being included in the Perry Mason novels.
When Louise calls Perry to inform him of what happened to the two girls, he is eating at a place called Clay's Bar and Grill. During the final season, Clay's would become a regular hangout for Perry, Della and Paul as well as Burger. Its owner, played by Dan Tobin, would become a semi-regular character as well.
This episode, for the first time, explains why Burger has such a vendetta against Perry. He wants to run for governor. His track record against Perry can't be much help.
During the opening, Perry reveals Della Street's home number when he speaks with Louise Marlow on the phone. Perry tells her to call Della Street at Hollywood-21799.
This is the first case in which Della Street was called to the witness stand.