One of Us: Mr. Harmon frequently links to tvtropes in his blogs, such as a note as to how the TVTropes page Stock Superpowers contained some of the best descriptions of superhuman abilities as well as a warning as to the time-consuming effect of reading TVTropes.
Shrug of God: A bit more than ten years ago, the Event changed the world. What caused the Event? What is the source of breakthrough powers? When cornered, the author has been known to say "I don't know. But I have some ideas." And he smiles. (Author note: For those seeking clarity, Mr. Harmon has also looked at the Shrug of God trope page and pointed out #8 as the chief culprit. This puts this Shrug of God firmly into the Riddle for the Ages sub-trope.)