After Paul stabs Dr. Temple, Dr. Temple pulls the knife from his chest. When Dr. Temple dies a minute or so later, the knife is still protruding from his chest.
As Robert Culp drives away from the hut, it is supposed to be very windy, yet only the vegetation and tumbleweed in the foreground move. The trees, shrubs and thatched roof are perfectly still.
The strings controlling the creatures after coming out of the bodies of Dr. Temple and Laurie Cameron can be seen as they move across the floor.
The exteriors supposedly set in Tijuana have English street signs.