These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Echo & The Bunnymen's cover of "People Are Strange" certainly stands out.
Harsher in Hindsight: Subverted. In The Thirst, Sam is stated to have died when he attacked Edgar at the end of The Tribe, with the film's release several months after his death making it seem like a Real Life Writes the Plot, except shooting had finished prior to Haim's death.
Ho Yay: David and Michael. Just...David and Michael. David pretty much seduces him in a strange blood drinking sequence, half hypnotises him with continuous usage of his name, ignores the pretty love interest in favor of Michael, and spends the whole movie trying desperately to get Michael to see things his way. Never mind David's insistence leads to him dropping his guard, therefore leading to his death... he never makes a move to kill Michael, even when his victim blindly refuses to become a full vampire. David actually looks genuinely hurt by this rejection. The amount of eyesex and shimmering sexual tension in this film concerning these two is just amazing. This could translate to Foe Yay as well.
Shocking Swerve: In the original film, the reveal that David's not the head vampire; it's really Max, the mild mannered local business owner & current boyfriend to Sam & Michael's mother. However, the groundwork is there, it's just done so subtly that you likely won't notice them on the first viewing.
In The Thrist, DJ X is set-up as the Alpha Vampire, it's revealed towards the end that it's really Peter Lieber, and most of the film was an Evil Plan so he could turn Edgar into his personal hitman.