In Chapter 15: "Now Boarding" a top secret file called "Alien Artifact Storage List" can be scanned. The file mentions that the aliens have manuals with a title that roughly translates as "Serving Humans."
In Strangelove, General Jack D. Ripper believes fluoridation is part of a conspiracy. In Area 51, the player can read an illuminati letter titled "Water Fluoridation Plan" (found in Chapter 15: "Now Boarding") saying water fluoridation is their doing, for the duel purpose of removing fluoride, an industrial waste, and allowing the human body to prosses it, as well as an agent to increase cancer rates and decrease longevity "within the least desirable demographics." The document ends with a side note saying, "As a side effect, it does in fact reduce tooth decay".
In Chapter 13: "Lies of the Past", in the section "A Small Step for a Man", the "Give me a vector, Victor", "Roger, roger" etc. conversation from "Airplane" is quoted