 In some shots this flying wing footage is from Republic's "Spy Smasher" serial (used in chapter three of "Disc Man"), where the tail fin is missing (the flying wing was built for "Spy Smasher", and the tail-fin with rising sun insignia was added for Republic's "King of the Mounties" serial).Stock footage from several earlier Republic serials was reused to pad out "Disc Man" in order to lower its production costs.This includes the rocket crash from "The Purple Monster Strikes", a car chase from "Secret Service in Darkest Africa", and various scenes from "G-Men vs. the Black Dragon".