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Continuity mistake: Before Dana and Marty enter the control room and release all the monsters into the control centre, there is a thermos flask and a torch sitting next to each other on the control room's desk. But once they enter the control room, the position of the thermos flask and torch have changed without anyone touching them.
Answer: With all the monsters being kept in captivity, it would make sense for the facility to have an armory as well. Guns may have been handed out once the cages were opened.
Captain Defenestrator