The story Jet tells Spike about the man dying in the savannah is a short story written by Ernest Hemingway entitled 'The Snows of Kilimanjaro'.
Julia's car is a 1948 Tucker Torpedo. This rare and short lived automobile was extremely advanced for its time, possessing such things as a directional center headlight, and a Franklin Air Cooled engine, originally meant for the Bell 47 Helicopter. Julia's version is a convertible, which was rumored to have been planned but no documents are known to exist to prove this.
The title of the final episodes of Cowboy Bebop, "The Real Folk Blues" is also the name of the song by Yôko Kanno that ends every episode (except the last).
Punch's real name is Alfredo.
The red eye popping bounty is named Assimov. This is a reference to Isaac Assimov, the science fiction writer of the foundation series.