Visible crew/equipment: When Ethan is going into the space ship, one of the critters pursues him. We then can see a man's shadow on the ground, most likely the cameraman's shadow. (01:04:15)
Visible crew/equipment: When Charlie is in the ventilation system and says, "I could use some help here," the boom mike briefly pops into the picture. (00:44:40)
Continuity mistake: In the beginning scene it says "Somewhere in Kansas 1992" but it picks up where Critters 3 left off, in the apartment building basement in L.A.
