Other mistake: In the character selection screen of the Arcade version, J. Max's profession is "Quaterback", in an obvious misspelling of "quaRterback." The SNES version fixes the typo. Also, to be precise, you shouldn't break the word "profession" into "Profe - ssion" leaving the double S on the same line.
Character mistake: J. Max's ending has a long and intentionally comical epilogue speech delivered in erudite style. However, it contains an obvious misspelling when it says; "Wherever these are people" instead of "there are."
Character mistake: In Brocken's ending, he says "Presntable, never" in a clear misspelling of "presentable."
Other mistake: The arcade version mentions in the demo "How to play" reel "Various ways of prssing buttons", forgetting an "E."