Cowboy Bebop at His Computer: The manual! The story given in the manual is completely inaccurate and, in fact, makes the story in the game harder to understand! (Why would Draygon be searching for the tower if he built it?)
No Export for You: Despite being released in the USA, neither the original game nor the GBC port has ever been released in Europe.
What Could Have Been: Back when SNK thought the Neo Geo might make it as a console (and not just be used as a cheap arcade machine) there were plans to remake Crystalis for that platform.