Contractual Immortality: After Swamp Thing returns to Earth he exacts revenge on the conspirators that "killed" him... except for Lex Luthor, the mastermind behind it all. Justified, as Swamp Thing had no idea Lex was even involved.
Exiled from Continuity: With some exceptions. When Swamp Thing officially went to Vertigo Comics, it was no longer considered continuity, for all intents and purposes. Once the series ended, he would make sporadic appearances here and there, often with a Shout-Out to the series. He was later welcomed back into official DC continuity during Blackest Night.
Executive Meddling: Rick Veitch had planned a storyline where Swamp Thing would travel back in time and meet Jesus Christ. The DC brass put the kibosh on that, and Veitch quit the book.
Recycled Script: The time travel storyline that ended Rick Veitch's run has the same structure as a Len Wein issue (yes, a single issue) involving time travel. In both cases Swamp Thing would be thrown through time, would meet several of the locals, as well as an immortal that he keeps running into, and would eventually come in contact with an object (a crystal in the first case, the chunk of amber in the second) which would launch him back into the timestream. The big difference is that the Wein story Swamp Thing is moving forward in time, and the Veitch stories he's moving backwards. It's especially strange that Swamp Thing doesn't even Lampshade this, since time travel is actually a pretty uncommon experience for him.
Science Marches On: The famous issue "The Anatomy Lesson" establishes that the Swamp Thing was actually a plant that absorbed Alec Holland's memories, and not Alec Holland somehow turned into a plant. Scientist and fellow plant-person Jason Woodrue, AKA the Floronic Man, came to this conclusion after reading about how a planarian worm was taught to run a maze, then got chopped up and fed to other worms who then ran the maze perfectly as well, implying that knowledge can be passed on as foodstuffs. That was actually a very real experiment — that was also very wrong. The worms were actually following the slime trail of the first one; a good maze scrubbing later, and the worms' supposed assimilated knowledge evaporated into thin air.
The Shelf of Movie Languishment: Neil Gaiman's run, cancelled after Gaiman withdrew in protest over the controversial censorship of the intended climax of Rick Veitch's previous run.
China Miéville's aborted run, which got nixed because Geoff Johns wanted Swampie back in the main DCU. Five scripts were even written when it was cancelled.
Also Neil Gaiman's run, which would have followed Veitch's. He pulled out of in protest after Veitch's "Jesus" idea was vetoed, but he's said that it would have built up into a crossover of all DC's plant-themed characters.
Mark Millar's run was supposed to have climaxed with Swamp Thing #175, but he ran out of Grant Morrison-written scripts to slap his name on, forcing the massive storyline he wrote to be prematurely ended and the series cancelled with issue #171.
A Swamp Thing/Poison Ivy story was written in the mid-90s for publication, but was shelved due to to conflict between Vertigo and Batman editors. The story would have revealed that Alec Holland and Poison Ivy had an affair, with Ivy spending years bleeding Alec Holland dry financially and forcing him to steal chemicals for Ivy to use in her criminal capers by threatening to out the affair to his wife Linda. Years later, Ivy and Swamp Thing would meet for the first time as Ivy attempts to gain plant-based elemental power and Swamp Thing would unleash unspeakable vengeance against Ivy for the years of torture Alec endured; when she uses her power to turn herself into an elemental, Swamp Thing would use his own powers to override Ivy's usage of her own new power, turning her into a tree then stripping her of the ability to turn herself back via destroying the artifact she used to gain her powers, trapping her in an And I Must Scream hell. The story never got published because the Batman editors got tipped off that the Vertigo editors not only would not let them undo the story so Ivy could appear in future Batman stories, but they would attempt to strip Batman editors and pretty much any other DC writer of any chance to use Ivy again, by claiming that since she appeared in a Vertigo book, she was now irreversibly Vertigo property.
The films:
Acting for Two: Dick Durock (Swamp Thing) also portrayed the agent that was leaving the island when Charlie and Cable first land in the plane.
California Doubling: Although set in the Louisiana Bayou, filming largely took place in Charleston, South Carolina, and nearby Johns Island.
Executive Meddling: Wes Craven had nothing kind to say about the completion bond company on this film. "I won't name any names, but they were not friendly, and they were not helpful. They just played the tough guys all the time." They demanded Craven cut scenes from the third act so they could stay on schedule and under budget.
, which got nixed because Geoff Johns wanted Swampie back in the main DCU. Five scripts were even written when it was cancelled.