Some houses in the game have paintings of Sir Arthur from Ghosts 'n Goblins, another series developed by Capcom.
Contributed by MaronaPossessed
Karn, whose name was Danc in the Japanese version, received a "race-lift" in the overseas release, going from a pale, almost ash-grey skin-tone to vaguely Arabian-looking. Given that the face portrait seems to be done in the stereotypical (and culturally offensive in the west) "Blackface"-style, it isn't too surprising this was changed.
Contributed by Cavery210
Chun-Li, from the Street Fighter series, makes a cameo appearance in the game. In Bleak, speak to the magician who says that he can make 100g disappear. Answer "yes" twice, "no" twice, and then yes. You'll see Chun-Li in a small room performing her famous Lightning Kick.
Contributed by Dazz