The name of the mill is "Bachman Mills." "Bachman" is a pseudonym used by Stephen King, upon whose short story the movie was based.
When John and Jane are in the cafe together, Ippeston sitting in the booth behind them is reading a paperback of "Ben." "Ben" is a story of a socially dysfunctional boy who befriends a rat and uses other rats to extract revenge upon others.
Tom Savini was attached to direct the film in the late 1980's but pulled out due to lack of studio interest.
Co-stars Andrew Divoff and Raissa Danilova later married two years after this film was completed.
The movie was filmed in the village of Harmony, Maine at Bartlettyarns Inc., the oldest woolen yarn mill in the United States (est. 1821). The historic Bartlett mill was renamed "Bachman" for the movie, an homage to King's pseudonym, Richard Bachman. The interior shots of the antique mill machinery, and the riverside cemetery, were in Harmony. Other scenes (restaurant interior, and giant wool picking machine) were at locations in Bangor, Maine, at an abandoned waterworks and armory. A few other mill scenes were staged near the Eastland woolen mill in Corinna, Maine, which subsequently became a Super Fund site.
Wisconsky mentions she is from Castle Rock, home to many other Stephen King books and movies.
The patch on Cleveland's (The Exterminator) shoulder is the emblem of 33 ("Ba Muoi Ba"), a Vietnamese rice-brewed beer that was popular among American GIs who served during the war.
The producers were afraid that the rats would not be terrifying enough, so the talents of a top voice-over artist were added to the sound track.
It is unclear whether or not Diet Pepsi's product placement in this film (they allowed cans of Diet Pepsi to be used repeatedly throughout the film as projectiles fired at rats and at the giant creature near the end) proved beneficial to the Pepsi corporation.