This is the first time the character Perry Mason ever appeared on film.
The song "Dames," heard on the radio when Bessie Foley turns it on, is promoting the film of the same name released by Warners the same year.
The question of Perry and Della's personal relationship is clearly demonstrated in the movie. At about the one hour mark, Perry and Della are discussing the case in his office, and Perry takes Della's hand and sits her down beside him. During the conversation, Della rests her hand on Perry's thigh, and he covers her hand with his throughout the rest of the discussion. The final scene has Perry and Della embracing on the final fade-out.
The dog who played Prince in this film, Lightning, is the grandson of the silent film canine star Strongheart the Dog.
The letter Cartwright mails has the correct 13-cent postage for Special Delivery. The base 3-cent first-class stamp is on the right on the envelope. The stamp on the left is the 1927 Special Delivery 10-cent stamp depicting mail being delivered by motorcycle.