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.
The backpacks they wear are covers of vacuum cleaner parts.
Despite their futuristic appearance, most of the weapons in the film are actual production firearms, and not custom props. The rescue team uses Israeli Tavor TAR-21 rifles, while the refugees have German H&K G36 rifles.
Oddly, the rescue team uses Vietnam War-era ALICE canteens, despite most modern armies adopting Camelbak-style hydration systems in the late 90s.