Placer City celebrated Frontier Days, where some of the men grew beards and some others, including the victim, wore fake beards. Similarly, in The Case of the Barefaced Witness (1961) (featuring future Batman Adam West), Pinion City was having a celebration where men without beards were arrested. Paul Drake got caught in that "beard trap."
This is the last series entry where William Talman has a screen credit for a show in which he did not appear. He was fired shortly after this show was filmed and rehired months later, during season 4. Talman paid a price for the firing, After he was rehired, he no longer received a screen credit for shows in which he did not appear. This means he also received no paycheck for these shows.
The same still photo of actor George Mitchell (Amos Catledge) is used at least 4 separate times when viewing the character during the trial.