In the PlayStation, 3DO, Atari Jaguar and Saturn versions of the game, the "I'm Too Young to Die" skill level is replaced with "I'm A Wimp".

The song that plays during Map 09: Deimos Anomaly, "Breath of Horror", features several slowed down voices saying something unintelligible. Speeding up the song reveals that it is actually several slightly edited copies of the same sound clip of a few people singing what most closely resembles the phrase "Danny won! Hey!" and noises that fans have speculated sounds like a ping-pong match happening in the background. When asked about the origin of the clip in a 2010 Game Scares interview with the PlayStation version's composer Aubrey Hodges, he said: