Earl Bassett: What kind of fuse is that?
Burt Gummer: Cannon fuse.
Earl Bassett: What the hell you use it for?
Burt Gummer: My cannon.
When the lawn mower the heroes send off as a diversion crashes you can see a wire pulling it.
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.