When leading lady Beverly Garland got her first look at the titular monster, her sarcastic remark was, "THAT conquered the world?"
Originally, "Beluah" was built as a squat, flat-topped creature, under the mistaken belief that Venus had higher gravity than Earth's. (It doesn't; Venus' gravity is slightly less than ours.) When it turned out not to be imposing enough - and to actually be shorter than leading lady Beverly Garland - a tapering conical top was added to it.
Composer and musician Frank Zappa made a tribute to "It Conquered the World" in his album, "Roxy & Elsewhere" (1973). In the introduction of the song "Cheepnis," Zappa tells the audience that he loves monster movies. "And the cheaper they are, the better they are." Frank Zappa describes this movie as a perfect example of monster movie with its alien with an "inverted ice-cream cone head with fangs." He describes one special scene when the "monster came out of the cavern" and he could see the technicians pushing the creature over the rail. "This is cheepnis," Mr Zappa concludes before playing the song.
Paul Blaisdell's friend Bob Burns restored the costume when it came into his possession long after Blaisdell's death. The photographs of it in his book "It Came From Bob's Basement" reveal it to be beet-red in color.
The little bat-like creatures that the monster uses to control people would later be re-used in Roger Corman's next film, The Undead (1957).