In Earl's trailer is the cover of People magazine with Earl (Fred Ward): and Valentine (Kevin Bacon): on the cover. In the first movie they both discuss about how they'll make it to the cover of People magazine.
Earl struggles with ostriches at the beginning of the movie while attempting to get them to mate. His difficulty may lie with the fact that both of them are male. Female ostriches are noticeably shorter and grey.
The film was originally meant to take place in Australia on a budget of $17 million, with Kevin Bacon reprising his role, in a wide theatrical release. When this idea approved but only given a budget of $4 million, the script was loosely rewritten to accommodate the budget.
During post-production, the creators campaigned for the film to receive a theatrical wide release. Although unsuccessful, the film did play in limited theaters across the world, including the TCL Hollywood Theatre, the Alfred Hitchcock Theater, and the National Theatre in Tokyo, Japan.
In the script, Earl and Grady venture inside the destroyed radio tower and discover multiple dead bodies. The scene was removed due to its interference with pacing and that it'd go over budget. Storyboards of this scene can be seen on the interior flaps of the original laserdisc release.
Earl points to a Playboy centerfold on his wall and says that it was Miss October of 1974. The real Miss October 1974 was Ester Cordet, a brown-haired Panamanian, in contrast to the blond Helen Shaver who, in the film, is supposed to be the woman in the photo. The actual centerfold seen in the film is of Miss September of 1970, Debbie Ellison.
To achieve the infrared view of the shriekers as seen in several scenes,the actors wore red suit's and yellow stockings,then were shot in Hi-8 video tape and blown up to 35-mm film, to add an additional grainy effect the post-production video engineers then rendered the faces and bodies in different colors.
The scene with the baby shrieker was created using a full-size shrieker in a large cage making the Shrieker look small, as a consequence no actors could be shown at the same time as the cage and shrieker.
Amalgamated Dynamics was faced with a challenge different from the first film, in Tremors (1990) the graboids spend most of their time underground and thus a prop was not needed for these scenes, however in this film the shriekers spend all their time above ground and there are always more shriekers than graboids thus the need for more props the Shrieker props used in the film include: Two fully-articulated full-scale puppet shriekers, Three hand-held puppet version's of the shriekers and Three un-jointed non-articulated rubber shrieker dummies, the fully-articulated full-scale shriekers required 16 puppeteers to operate, while rubber shriekers not requiring puppeteers were used in scenes when a shrieker needed to be drop, shot, or exploded/blown-up
In addition to the shriekers designed by Amalgamated Dynamics, some scenes in the film utilized shriekers that were CGI designed by Tippet Studio, these animated shriekers were used whenever the shriekers are shown walking, running, or climbing as the movements we're beyond the capabilities of the fully-articulated puppet shriekers.
Kevin Bacon was expected to return as Valentine McKee. But Kevin was promised a certain amount of money on his contract to reprise his role. But due to the unexpected budget cuts of the expected $17 million to just a $4 million budget. They unfortunately couldn't afford him to return.
There is a common misconception that the Graboid "Stumpy" the one with the missing tentacle from the first one is the Graboid mounted on Burts wall, it's actually the one that crashed through his basement which Burt killed with his elephant gun.
The trivia items below may give away important plot points.
When the oil field employee is attempting to recruit Earl for a graboid problem in Mexico he states that he had already tried to capture the services of Senor McKee, Earl responds 'Val married a good woman, why would he wanna die?' Implying both Val and Rhonda had wed in the years since the events of the first movie.
At no point during the film do you see the snake-like tentacles of a graboid actively moving or latching onto their prey despite the fact they play a prominent part of the first film. Although this sequel focuses primarily on the bipedal offspring of the graboids, the graboids themselves are seen on screen quite frequently in the first half.