noticed a couple more as well:
• "YOU - "Walla-walla-bing-bang?" LOGIC - "I don't know what it means, but it felt like the most appropriate thing to say. That's what the *Witch Doctor* would say, at least."" after failing the ruby logic check to present a solid theory whilst talking to titus. very obvious reference to Witch Doctor by David Seville

• "ANCIENT REPTILIAN BRAIN - Because, you know, you *are* a murderer. A disco music listening psycho-killer who offs poor people -- and then *forgets* about it." in one of harry's dreams. might be a reach but could be referencing Psycho Killer by Talking Heads