However, Kenji MURAKAMI, a ghost researcher and a writer, points out such Ungaikyo that have a distorted figure and is exaggerated in its capability, originated from the Ungaikyo that appeared as an old-looking raccoon dog in "Yokai Daisenso" (The Great War of Ghosts), a special effects movie made in 1968.
しかし、妖怪研究家（作家）・村上健司の指摘によれば、そのようなデフォルメされた形と能力を持った雲外鏡の原典は特撮映画『妖怪大戦争(1968年の映画)』に登場する古狸（ふる-だぬき）様の雲外鏡にある。