Director Claudio Fragasso and his wife Rossella Drudi, who only spoke Italian, wrote the screenplay in very poor English. On set, the actors suggested they ad-lib their lines, to make the dialog sound better. Fragasso forbade that; all of the lines had to be read as written.
Director Claudio Fragasso is still angry about the film's poor reception. He crashed a cast reunion Q&A. After he was escorted out of the room, he heckled the cast from the hallway, calling them "liars" and "dogs" as they answered fan questions.
In Best Worst Movie (2009), Don Packard, said that he was in-and-out of a mental hospital during filming. When he watched it later, he realized he wasn't acting in his scenes; he really was as disturbed as his character.
For George Hardy's audition, all he did was act out his now famous line "You can't piss on hospitality!" in front of nine smoking Italians, none of whom understood English. George was told that he got the role partially because the Italians loved the energy he put into it.
Jason Steadman wore a yellow shirt with a logo during the first half of shooting. It got lost at one point, and instead of re-filming all of the scenes with a different shirt, the film crew told Steadman to buy another yellow shirt. The shirt he bought didn't look like his previous yellow shirt, but he still had to wear it for the rest of production.
Morgan, Utah, where the film was shot, held a "Troll 2" festival in 2007. The town was transformed into the fictional town of Nilbog seen in the movie. Screenings of the film were held, and the Mayor of Morgan presented director Claudio Fragasso with the key to the city.
In fall 2007, during a special screening in New York, the cast members said that during production, they had serious doubts about how the movie would work. The entire crew spoke only Italian, except for the costume designer, who translated the director's directions to the actors.
When Arnold slowly turns into a tree, Darren Ewing's shoes were screwed into the base of the tree pot, allowing him to remain stationary throughout the scene. He had to stand inside the pot in his tree makeup for 14 hours.
Claudio Fragasso, intended a sequel to the film, titled "Troll 2: Part 2". Fragasso wanted to shoot a promo while filming "Troll 2." Joshua would run into a McDonald's, purchase a cheeseburger, scream, and flee.
The American VHS cover features an artwork consisting of a little boy with what appears to be a Troll doll being chased down a dark corridor by a werewolf brandishing an ax. Neither the boy nor the werewolf appear in the film, and as mentioned before, no trolls appear either.
The costume designer, Laura Gemser, is an Indonesian-born actress most famous for her multiple reprisals of Emmanuelle, the promiscuous journalist and star character in a number of Italian skin flicks and soft-core pornographic movies in the 1970s and 1980s.
The film was originally titled Goblins, but distributors in the US felt the film would not succeed on its own as a stand-alone project, so they insisted it be named Troll 2, despite not having anything at all to do with the first movie.
The day that they shot the scene in which Creedence Leonore Gielgud descends toward the trailer in a seductive black dress, it was so cold that actress Deborah Reed had difficulty keeping her teeth from chattering.
Deborah Reed, who played the witch, is the real-life mother of Gavin Reed, who portrayed one of the Nilbog children. The two auditioned separately and the filmmakers cast them without realizing that they were related.
The production crew was made up almost entirely of non-English-speaking Italians brought to America by Claudio Fragasso; the only fluent English speaker on set was Laura Gemser. Fragasso and his crew largely relied on a broken pidgin English to communicate with the cast, who recalled not being able to understand much of what went on.
Laura Gemser's design for the costumes consisted of burlap sacks and rubber Halloween masks-some which were reused in Joe D'Amato's Ator barbarian franchise-with only one goblin mask modified to have a moveable mouth. Eduard Sarlui also bought the rights to a goblin mask used in Troll.
Creedence Leonore Gielgud's main costume consisted primarily of personal family heirlooms which belonged to actress Deborah Reed. The dress and many of the pieces of jewelry belonged to her grandmother.
The trivia item below may give away important plot points.
At 15:30 in the Creative Screenwriting Magazine Filmmaker Q&A (included as an audio extra on the Best Worst Movie (2009), Michael Paul Stephenson says that the infamous "Piss on Hospitality" scene wasn't written that way. The script called for him to act possessed, jump up on the chair and start screaming. "On the day of the shooting, [Claudio Fragasso] pulls me aside, looks at the script, and says, 'Ah, possessed, that bull****, boring, you stand up, you piss on the table.' Being ten years old [I was] thinking, 'What?', but Claudio says, 'You don't worry, you jump on table, you unzip zipper, we cut, piss on table.'"