Ein the data dog is a Pembroke Welsh Corgi.
Men are such idiots.
Spike's hair changes from green to black repeatedly throughout the show.
In "The Real Folk Blues, Part 2", a black screen with the Cowboy Bebop logo begins the episode instead of the usual opening title sequence.
In "Session 22 Cowboy Funk" Spike, Jet and Faye go to a costume party to catch a bounty head. Jet is dress up as an hippy with a marijuana leaf on his shirt.In the TV version Cartoon Network edited out the leaf and replaced it with a peace sign.