* CriticalResearchFailure: There's a few of these scattered throughout the books, with the most egregious ones appearing in ''Atlantis Found'' and ''Trojan Odyssey''.
* HarsherInHindsight: Most notably the [[spoiler: plot to level half of Manhattan, outwards from the World Trade Center, which was thankfully foiled at the climax of ''Valhalla Rising.'']]
* ValuesDissonance / FairForItsDay: One subplot of ''Iceberg'' (1975) involves Pitt pretending to be CampGay to get a potential enemy to underestimate him. Sandecker even asks him why he's acting like a "faggot". Incidentally, [[spoiler:the foe in question is a homophobe (and a domestic abuser, and a CorruptCorporateExecutive, and a megalomaniac) and Pitt guessed that he would be when they met based on his personality. When Pitt reveals the truth, it's in the middle of beating five types of crap out of him, which is payback for the beating ''he'' got from him earlier, where he didn't break character. Also, he seems to have no problem with Kristjan becoming Kirsti, and is more concerned with the fact that she seems to have become a sociopath.]]