Trivia: The Mermaid spit "ink" at Dr. Beyer in his car. This suggests a Mermaid is similar to an octopus, squid, or cuttlefish (which have "ink sacs" - though anal, not oral!) and is a type of mollusk, not fish. However, mollusks are invertebrates, and the Mermaid in the movie apparently had a spine/backbone. (01:13:28)
Trivia: The first "Critters" film to be rated R, as well as the first film in the series to not feature actors Don Keith Opper and Terrance Mann.
Trivia: Spoilers: Among the video-tapes seen next to the TV after the opening credits are "C.H.U.D." and "The Goonies." This is quite relevant to the plot, in which it is revealed that the doppelgangers come from beneath the ground in a series of tunnels that used to be run by the government. "C.H.U.D." is about mutant creatures that live underground and have began to rise up and attack, like the doppelgangers, and "Goonies" takes place largely in underground tunnels and caverns, much like the film's climax.