** [[http://what-if.xkcd.com/21/ "Machine Gun Jetpack"]] gives us RecoilBoost.
** IcarusAllusion is the last image of [[http://what-if.xkcd.com/30/ "Interplanetary Cessna"]] (and the page quote is from the last paragraph of the same article).
** HardOnSoftScience is the first image and AltText of [[http://what-if.xkcd.com/111/ "All the Money"]].
* ReferencedBy: [[http://what-if.xkcd.com/98/ "I don't want to draw someone throwing up a gallon of blood, so here's a squirrel instead."]] [[https://youtu.be/xHePoR0mRTY This video]] about Jewish languages gives us "I don't want to talk about the Holocaust, so here's a squirrel instead."
* ScheduleSlip: There have been at least two extended periods (one from April to July 2015, and one from September 2015 to January 2016) where Randall has not updated the blog with little explanation, although evidence suggests that both periods are/were connected to book releases (one of which was the What If compilation).
* ImageSource: Trope pages with images from this series include: