* FakeNationality: Swedish Warner Oland playing Asian Dr. Yogami.
* [[HeyItsThatGuy Hey, It's That Guy!]]: Warner Oland, best known as CharlieChan, is Dr. Yogami.
* WhatCouldHaveBeen: The original werewolf design by Jack Pierce was reportedly similar to the one in ''Film/TheWolfMan1941'', but Glendon's actor Henry Hull refused to wear it.
** Creator/BelaLugosi was considered for the role of Dr. Yogami.
** Universal originally planned to do a film version of Guy Endore's book ''The Werewolf of Paris'', but the plans fell through when Endore was hired by MetroGoldwynMayer as a script writer.