- Broken Base: Revealing that Diogenes was still alive in The Obsidian Chamber. Many people feel he had no place returning and should have stayed dead after the events of Book of the Dead, while others like having him be brought back and point out that since we never actually saw him fall into the volcano and only had Constance's account, it perfectly left the door open for him to return later on.
- Ending Fatigue: The conclusion to Book of the Dead is hit with a bit of this. Even after the climax has happened, there's still nearly a hundred pages devoted to Constance hunting Diogenes across the globe.
- Ensemble Dark Horse - Corrie. Fans kept pestering the authors as to when she'd be back.
- Escapist Character - Pendergast shows traits of this.
- Fan-Preferred Couple - Pendergast/Corrie, Pendergast/Diogenes, Pendergast/D'Agosta, Pendergast/Constance...
- Homage: Pendergast is a much more sociable - and American - version of Sherlock Holmes. For example, he talks to D'Agosta in a 'My dear Vincent' fashion, uses the 'elementary' comment, and of course employs Sherlock Scans. This hits its apex in White Fire where part of the plot involves a long-lost Holmes story and includes several references to the original books.
- Ho Yay - Pendergast and D'Agosta have made more than one reader wonder.
- Like You Would Really Do It - Let's face it: did anyone really think that they would just kill off Pendergast at the very beginning of Cold Vengeance?
- The Scrappy - Constance and Viola, to some.
- Trapped by Mountain Lions: There are a couple of books where a supporting character has to deal with something that spins off of the main plot but is otherwise unrelated to it.
YMMV / Agent Pendergast