* AlternativeCharacterInterpretation:
** Some believe David (in his werewolf form) [[spoiler: pulled a SuicideByCop at the end after [[LoveRedeems Alex]] [[MyGodWhatHaveIDone reaches out to him.]]]]
** The NECA toys of the Nazi monsters from David's nightmare calls them “nightmare demons”. With how Jack confirms that the supernatural and forces of evil are real, someone could interpret, [[{{Retcon}} with the benefit of hindsight]], that the nightmare isn't just a nightmare - it's an actual psychic attack from real demons there to terrorize David.
* SugarWiki/AwesomeMusic:
** Music/CreedenceClearwaterRevival's "Bad Moon Rising" makes a huge impression, somehow, despite the fact that not much really happens while it is playing. (The great transformation scene does '''not''' take place to this tune, but to Music/SamCooke's version of "Blue Moon.")
** Music/ElmerBernstein composed about eleven minutes of music for the film, which was so good that the technoband Meco based an entire album on it. [[https://youtu.be/5bbmLnu2g8I A fan recreated his unused track]] for the transformation scene, and it pushes the scene from just disturbing and sad to downright horrifying and menacing (ironically, it probably would’ve resulted in the film receiving the same criticism fellow werewolf film ''Film/TheHowling'' received, in that the transformation scene was so horrifying and well done that nothing else in the film afterward lived up to it).
* CreepyAwesome: The transformation sequence is pure NightmareFuel but also pure SugarWiki/VisualEffectsOfAwesome.
* CrossesTheLineTwice: Discussing suicide? Disturbing. Discussing suicide with several bloody corpses (including your rotting friend) in a porno theatre while some of the undead cheerily throw out suggestions for how to do it, from hanging yourself to throwing yourself in front of a tube (subway)? [[BlackComedy Hilarious.]]
* HarsherInHindsight: When David and the spirits of his victims discuss the ways he can kill himself, David suggests that he can hang himself. Jack dissuades him from using that method, pointing out that it could go wrong and, instead of a quick neck snap, he could instead suffer a slow and painful choking to death. In 1982, Creator/GriffinDunne's younger sister Dominique was strangled to death by her ex-boyfriend; the coroner estimated that it took her at least four minutes to die.
* SugarWiki/HeartwarmingMoments:
** Jack telling David to not cry after the latter starts breaking down after Jack reveals to him the predicament that's he's in and to commit suicide to prevent him from harming others. Later at the porn theater, crossing with BlackComedy, Jack gets defensive when Ted bids David to choke if he tries and fails at hanging himself with: "Do you mind? The man's a friend of mine!" He needs David to die but he won't accept people wishing his bestie ill, damn it!
** Alex's cute moment at the hospital with little Benjamin who wants to stay up, [[MoodWhiplash right before]] David's transformation.
* MemeticMutation: In 2013 Creator/JoeRogan showed in a vlog his cute Labrador dog standing next to the nightmarish life-size replica of the werewolf he commissioned, which starting from 2018 has raised in memetic popularity (usually with something calm being represented by the dog and something worse represented by the werewolf, for example).
* {{Narm}}:
** For some, the ironically upbeat songs picked for the soundtrack kinda ruin the moments they accompany. A Website/YouTube commenter once remarked on a clip of the transformation scene they nearly left the page after starting because they thought the clip, featuring David's horrific transformation accompanied by jazzy, romantic crooning, was a parody.
** The fact that the climax starts up in a porno theater with a movie playing is supposed to be intentional SoundtrackDissonance, but it's completely impossible to take seriously. Listening to [[TheImmodestOrgasm a girl aggressively moaning]] as the werewolf gorges itself on a ticketer's corpse is bound to take anyone out of the film with how silly it is.
* OlderThanTheyThink: Many believe the movie invented the closet mirror JumpScare for Jack's more decomposed looking ghost (Creator/EdgarWright openly stated to have recreated it in ''Film/ShaunOfTheDead'' as a homage), but in reality Creator/RomanPolanski did it first in ''Film/{{Repulsion}}'').
* RetroactiveRecognition:
** The dart player is David Schofield, who would play Mercer in ''Franchise/PiratesOfTheCaribbean''.
** Creator/RikMayall plays a patron at The Slaughtered Lamb.
** The policeman in Trafalgar Square who successfully manages to ignore David's volley of swear words is played by Peter Ellis, who only a few years later went on to play the regular character Chief Superintendent Charles Brownlow in British long-runner ''Series/TheBill''.
** Gerald Bringsley is played by Michael Carter, who would go on to play Bib Fortuna in ''Film/ReturnOfTheJedi'' and Radu Molasar in ''Film/TheKeep'', as well as multiple voice roles in ''VideoGame/DemonsSouls'' and ''VideoGame/DarkSouls''.
** The Cockney taxi driver who warns David and Alex about the murders around London is played by Alan Ford, who would be best known from ''Creator/GuyRitchie's'' gangster films, ''Film/LockStockAndTwoSmokingBarrels'' and ''Film/{{Snatch}}''
* SignatureScene:
** The {{painful transformation}} sequence, of course!
** The oft-parodied shot of David closing a bathroom cabinet and screaming when Jack is revealed behind him in the mirror.
* SpecialEffectFailure:
** The titular werewolf itself is pretty hokey looking at times. It doesn't blink and barely changes expression, a metal rod can be seen poking out of the prop in a few shots, and at one point, Baker can be see operating the puppet as it bites the inspector's head off. The fact it was called in at least one book reviewing werewolf movies as a "fat German Shepherd" says all one really needs to know about what it looks like when seen in direct shots.
* SpiritualSuccessor: To ''Film/WerewolfOfLondon'' and ''Film/TheWolfMan1941''.
* UnintentionalPeriodPiece: Because David calls Prince Charles' sexuality into question in the film, a disclaimer was added to the credits which read "Lycanthrope films limited wishes to extend its heartfelt congratulations to Lady Diana Spencer and His Royal Highness the Prince of Wales on the occasion of their marriage -- July 29th 1981".
* SugarWiki/VisualEffectsOfAwesome: Rick Baker, so much that he won the inaugural UsefulNotes/AcademyAward for Best Makeup in 1981.
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