* NightmareFuel: Jack Pierce's makeup werewolf for Henry Hull is ''frightening'' even if it's more humanoid than wolf. Gives the impression of a deformed lupine man, but for some fans looks more feral and ''ruthless'' in comparison with Lon Chaney Jr's posterior makeup.
** The transformation scene is gradual, and the tense ominous music certainly does not help.
** After his transformation, Wilfred Glendon mantains his human conscience and tried to use the mariphasa antidote, but dark feral thoughs appeared in his mind, and with the intelligence of a human, he ''disguises'' in human clothes, a cap and coat to hide and hunt in the city.
** The howl was created using a real timberwolf howl mixed with Henry Hull's voice. Gives the horrible impression of being both, wolf and human, like the disturbing noises that [[Film/TheWolfMan1941 Lawrence Talbot did six years later]].
** Dr Yogami says that the werewolf is a satanic creature that wants to destroy instinctively what he loves. Also, they have the worse features of a man and a wolf.
** Werewolf! Wilfred's kills. He kills a random girl [[NothingIsScarier and we only see him chasing her]]. The next day's newspaper says that her corpse was unidentified (practically unrecognizable) severely ''mangled'' which implied that he rips her into pieces or even ate her partially. Later, he kills another girl, distracting his husband with a London Zoo's wolf.
* OlderThanTheyThink:
** As one of the most underrated films of ''Franchise/UniversalHorror'', many fans ignore the fact that, among this movie being the first non-lost werewolf movie, also introduces the full moon as the cause of the werewolves transformations.
** Some fans think that ''Film/TheWolfMan1941'' introduced the full moon transformations, but the concept was first applied to Lawrence Talbot's character in its sequel ''Film/FrankensteinMeetsTheWolfMan''. Some fans even think that the full moon being a cause of a monster going on a rampage had its origin in ''Film/TheMummysHand''. Those three movies came after ''Werewolf of London''.