Danny DeVito refuses to eat junk food, so the donuts he eats in this film aren't fried, contain no sugar, and are fat-free. They were made to order by Mani's Bakery Cafe on Fairfax in Los Angeles.
Rhea Perlman's father (and Danny DeVito's father in law) who appeared as a supporting character on Cheers with his daughter, can be seen in at least two views of the audience at the shareholder meeting during Danny's speech to the stockholders.
The factory shown in the shots from across the river WAS the Gilbert & Bennett Mfg. Co. located in Georgetown, Connecticut (part of Wilton/Redding CT), and was vacant for years after operating as a brass and wire plant for over 100 years and a local landmark. The building was demolished in 2003 for commercial and residential development.