12?:1 Arkham Asylum is where most of Batman's enemies are incarcerated in Gotham City. Woodrue fought ST in issue #24. Arkham is visited by ST in issue #52 and is visited by Constantine in issue #66.

12:??? These are characters who were created for the CRISIS ON INFINITE EARTHS "maxi-series", which began five months later in April 1985. The Monitor was a powerful pan-dimensional being who secretly observed and studied events in the DC comic universe for several months prior to the CRISIS ON INFINITE EARTHS series. He briefly appeared with his assistant Lyla (a.k.a. Harbinger) in almost every DC title during that time. In the CRISIS maxi-series it was finally explained that he planned to save all the parallel universes by combining them into one universe. The universes were threatened by the evil Anti-Monitor. Swamp Thing learns of the Crisis in issue #46.

18:5 (or page 19 in the trade paperback) Why does the license plate say GMJ?
The bumper sticker says "Proud to be coonass." "Coonass" refers to the Cajun people of the southern Louisiana region, and while some are proud of the ethnic slang term others find it offensive. The writer mentions this on page 23 of his book "Alan Moore's Writing for Comics."

COMMENT: In 1990, DC Comics collected/reprinted issues 28-34 and SWAMP THING ANNUAL #2 in a book titled "Swamp Thing: Love and Death", but this issue's scene with the Monitor is excluded.

COMMENT: This issue is reprinted in black and white as ESSENTIAL VERTIGO: SWAMP THING #10, August 1997.