When Mindy is getting her picture taken next to one of the graboid's tongues, look at the shelf of movies behind her when the camera zooms out its farthest in that shot; in the second row down (I think it's the in the second row down), if you look really closely, you can see that one of the movies is Tremors.
Reportedly, star Kevin Bacon was at a rough patch in his life during production and didn't understand the appeal of the film or the light-hearted comedic elements. (Even once breaking down in public and exclaiming in frustration "I'm in a movie about giant underground worms!") And thus, he chose to have no involvement in the sequels. It wasn't until some years later that he decided to re-visit the film and give it another chance after it became a massive cult-hit, and discovered that he actually really loved it. Bacon has since gone on record saying one of his dream projects would be to reprise his role of Val McKee in a future film.