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Anachronistic Hardware
Despite being pulled from time by Dr. Brown in 1922 (born 1891 + 31 years old), Brocken's backgrounds in World Heroes 1 and 2 both feature German vehicles from WWII (1939–1945). The tanks in his WH stage appear to be Pzkpfw. VI Tigers and the airplane appears to be a Focke-Wulf 190. The tank that breaks through the wall in his WH2/Jet stage is a Jagdpanther.
Great Scott
One might think that Dr. Brown, the time-travelling doctor of the World Heroes series, may have the first name Emmett. His full name is, however, Brown Sugar.
World Zeroes 2
The Neo Geo CD fan disk "ADK World" contains some early and unused character sketches for various games. Clockwise from upper left, these World Heroes 2 sketches are: Yagyu Jubei, Asteca, Urakan, Eris, Graham, Sinbad, Jeek Freet (Siegfried?? apparently from Finland), King, Gozu, Myusha, Riala, Ramses II, Heinrich, and Dracula.