* There is a small reference to Quasimodo the "hunchback".
* There is also a reference to the Sarin Gas Attack on Tokyo which was almost at the same time of the issue's release.
* This is the first issue of the Batman: Contagion storyline.
* Batman: Contagion continues in Detective Comics #695.
* This issue is reprinted in the Batman: Contagion collected edition.
* The Ebola virus is a real virus and it can produce lethal outbreaks.