When Trent asks Dean if she hit him with a "mashie or a niblick", he is referring to the kind of golf club she used. At the time, golf clubs had names and not numbers - which would not come into use until after WW2. A "mashie" would be the equivalent of a modern 5-iron, and a "niblick" would resemble a 9-iron.
Although Edgar Kennedy frequently played comically bumbling cops, this was a rare opportunity for him to play a reasonably competent one.
The $30.00 that the Elissa Landi character pays the Raymond Hatton character to pose as a dead body would be the equivalent of over $620.00 in 2022.
Mert Morgan's young photographer engages in the 3-wristwatch routine in response to "What time is it?" in this film. Those familiar with The Three Stooges will recognize it from routines in at least three of their short films: Dutiful But Dumb (1941), Rhythm and Weep (1946), and Studio Stoops (1950), all years later and mostly word-for-word. This film also uses some classic stooge routines, mostly slapstick comedy, that they made famous together with Healy. In the 1920s, Ted Healy got Moe (Howard), his brother Shemp, Larry (Fine), and later Curly, to do comedy in vaudeville and nightly theater shows with him as his stooges. They separated in the 1930s for different career directions, with the stooges going to short film comedies and Healy in features like this film.
E.C. Bentley wrote the popular detective novel Trent's Last Case in 1913. Its central character, the artist and amateur detective Philip Trent. Coincidence or not.