The line "The newest variety" voiced by Guy is a reference to the original title of the short story, Second Variety, of which this movie is based.
The interior walls of the bunker are made up of pie and muffin forms as well as cardboard egg crates turned upside-down and painted gray. The factory tables and shelves are stainless steel kitchen equipment.
Oddly, the rescue team uses Vietnam War-era ALICE canteens, despite most modern armies adopting Camelbak-style hydration systems in the late 90s.
The backpacks they wear are covers of vacuum cleaner parts.
Some of the survivors of Sirus 6b are using modified Heckler & Koch G36C.