1:1 The previous Earth Elementals Bog Venus, Saint Columba, Ghost-Hiding-in-the-Rushes and Kettle Hole Devil all first appeared in #47. They formed a Committee to ensnare ST permanently into the Parliament of Trees in issue 68, and departed for other
planets in issue 74.
4-5:1 Swampy had to leave to explore the USA under Constantine's instructions in issues 37-49. ST was lost in space in issues 54-63.
4-5:8 See issues 65-76 for the whole story on the necessity of creating a new Earth Elemental.
7:1 This retired elemental was Alex Olsen who appeared in the very first SWAMP THING story in HOUSE OF SECRETS #92, which was reprinted in SAGA OF THE SWAMP THING #33.
8:1 The "Swamp Knucker" was an elemental dinosaur sent by the Parliament of Trees to thwart Swamp Thing and to sacrifice a human to create the next Swamp Thing in 73.
9:6 This message will be explained in issue #89.
12:1 Swampy possessed Constantine's body in order to father a child with Abby in 76.
13:3 The aliens attacking ST are the Dominators. It's all part of the "Invasion!" crossover story. More on this in next issue.
20:5 "Only 999.99" is meant to sound like a typical advertisement. "Here's Johnny!" was said in the nightly opening of the Tonight Show when it was hosted by Johnny Carson. "Please don't squeeze the Charmin" is the slogan of Charmin toilet paper. "More power to the phasers, Scotty" was a typical line from the Star Trek TV series. "It's a wonderful day in the neighborhood" was part of the opening song of the Mr. Rogers' Neighborhood TV series.
23:1 You can hear this Dylan song at http://www.bobdylan.com/albums/bringing.html but it's dated 1965, not 1967 as Chester says. A fan's letter pointed out the date in issue 84's letter column.
Chester and Liz (and ST) met Superman in last issue.
Note that every scene change in this issue ends with a statement using the word "home".
COMMENT: In late 2006, DC Comics collected issues 77-81 and ANNUAL #3 in the trade book "Swamp Thing: Infernal Triangles". SWAMP THING ANNUAL #4 has not been reprinted yet.