Other mistake: In the NES version: After beating the end boss "For this the final confrontation," you get an ending screen that commits the all too common mistake of spelling a possessive without an apostrophe ("Robocops performance" instead of "Robocop's performance").
Other mistake: In the NES version: After beating the end boss "For this the final confrontation," you get an ending screen that commits the all too common mistake of spelling a possessive without an apostrophe ("Robocops performance" instead of "Robocop's performance").