Yeah, it's pretty un-PC. But Bert Williams was the foundation of modern American comedy as well as a Black pioneer, so with this film (which is MUCH better than his other short "Fish"), you're getting history in the making.
The plot has been dealt with, as well as highlights such as the one-man poker game, the courtroom scene, and the graveyard hijinks. But what most modern viewers don't know is that Williams actually wrote and directed this film and it was actually a compilation of his classic stage routines (based largely on a skit called "The Darktown Poker Club" which also exists in record form) strung together in a makeshift story. The graveyard scene, by the way, is also a Williams' stage gag based on authentic Black folklore.
Bert made two other films, "Darktown Jubilee" (now lost) and "Fish" (mighty weak). This one preserves what made him so appealing on stage to audiences of the early 1900s. Laugh and learn from the foundation.