* The subway sequence echoes an early scene in the film ''Film/JacobsLadder'', right down to the name of the street the Jacob is trying to reach.
* The unlockable Beam Saber weapon is based on the Laser Blades used by the heroes of the Japanese ''Space Sheriff'' superhero shows, ''[[Series/SpaceSheriffGavan Gavan]]'', ''[[Series/SpaceSheriffSharivan Sharivan]]'', and ''[[Series/SpaceSheriffShaider Shaider]]''. In particular, the way Heather activates the Beam Saber by drawing her hand along the blade mimics the way the sheriffs would charge their weapons up for their {{Finishing Move}}s.
* There's a scene in the [[DarkWorld Dark Office Building]] where a lone wheelchair is visible from a great distance, illuminated by a single light. Word of God has confirmed this is a shout out to the memorably creepy "Hello...Gordon" scene from "Session 9".
* Solid Snake appears as the corpse in the wall of the construction site where you get the silencer. This isn't clear in-game but was confirmed by Konami.
* The Borley Haunted Mansion at the amusement park is almost certainly named after, well, the [[ExactlyWhatItSaysOnTheTin Borley haunted mansion]], better known as the Borley Rectory, reputedly the most haunted house in England.
* Heather's Princess Heart outfit is a pastiche of {{Magical Girl}}s in general, and Franchise/SailorMoon specifically. That's one [[http://www.youtube.com/watch?v=wOxbkuD-JZI Sexy Beam]]!
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