The name of the mill is Bachman Mills. Richard Bachman is a pseudonym used by Stephen King, upon whose short story the film was based.
(Around 40 minutes): In Mac's Tavern, where Brogan and Danson are taunting Hall about being picked to join Warwick's Fourth of July clean-up crew, Ippeston is reading the novelization of Ben (1972) by Gilbert Ralston, the story of which revolves around killer rats.
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 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.