In the level Castle's Apartment, the game's principal artist Frank Marquart hid references to rock musician characters from other Marvel properties on posters throughout the room, as part of an effort to include references to the larger Marvel universe in the game:

• After the Punisher smashes the Russian's head into a few computer monitors and retaliates by tossing Punisher through a wall into a bathroom, a poster with the words "Lila" and a guitar can be seen. This is a reference to the X-Men character Lila Cheney, an intergalactic teleporting mutant who is a famous rock star within the Marvel universe.
• Another poster can be seen near where the Punisher lands after the Russian throws him through a wall into the computer room. The poster has eyes and a unique marking, with the text "Dazzler" above them. This is a reference to the X-Men character Dazzler, a mutant with the ability to convert sound vibrations into laser beams, and much like Lila Chaney, is a popular pop star in the Marvel universe. The poster incorporates Dazzler's blue 1970s-inspired make-up.
• On a wall to the left of the monitors, a poster with the text "Steal This Planet! A Rock Fable" can be seen. This is a reference to New Mutants Annual (1984) Issue #1, and features the first appearance of X-Men character Lila Cheney in a plot to steal the earth.