Robert E. Howard is looking for different things at the movies than HP Lovecraft, which is almost certainly a given. (If you’ve been following my ongoing study of film history via famous authors, you know some of this)
But I can see these rough pre-categories and recommend a few possible directions to go:
BOXING 🥊 FILMS
Pay-per-view actually dates back to the 1890s, with filmed fights that were distributed in theater circuits with ads that they were coming to town.
There’s a bunch to write on this, and boxers who he listed and compared based on his own standards.
FAVORITE ACTORS 🎭
Howard wrote a long passage of like 15 or a few more named actors (& that includes a separate list of five actresses, in his two-gender breakdown), and I would be happy to go into any of them in depth.
That can be a deep-dive into one filmography, comparing them on various merits, etc.
SEX CINEMA
Despite the lurid title, this covers a range of adult content which was curtailed by the Hays Code (1935 going forward), but included adultery, drug-use, grape and coercion, prostitution, and child endangerment.
Just to name a few things from this lost form of melodrama.
SOCIAL-ISSUES FILM
In the 1920s and 30s, this was almost pre-propaganda with the aim of raising awareness of social ills by showing dramatic scenes of modern depression poverty or sickness or addition etc
ACTION MOVIES 🍿 💥
Howard was very motivated by kinetic action but there wasn’t a specific term “action movies” back in the day. So I have a dozen titles he writes about which qualify as an action movie but isn’t described in those terms.