The original screenplay written by Jan Fischer and James Jeremias was originally about a bunch of "Goonie-type 5th-6th grade kid vampires", with the Frog Brothers being "chubby 8 year old cub scouts", and Star being a boy instead of a love interest. Joel Schumacher hated that idea and told the producers he would only sign on if he could change them to teenagers, as he thought it would be much sexier and more interesting.
The second time Sam visits the comic shop two men can be seen playing pinball. The guy with the facial hair is Joe Ferrara II who actually owned the comic shop Atlantis fantasy world. The comic shop has now moved location but is still owned by Joe.
This was Corey Haim and Corey Feldman's first film together, which marked the start of a popular 80s trend "The Two Corey's" in which Corey Feldman and Corey Haim starred together in a number of teenage films.
In the cave of the Lost Boys you can see a poster of Jim Morrison who recorded the original version of "People are Strange" with The Doors. And when Star and Laddie are being carried into Sam's room, you can see a poster of Echo & The Bunnymen who recorded the version used in the movie.
Though almost all of Kelly Jo Minter's scenes are deleted from the film, and the only true appearance she makes is over Lucy's shoulder in the video store, she still received billing the film's opening credits. Her scenes can be viewed in the 2004 Lost Boys DVD special features.
Both of the two 1987 movies about a "family" of attractive vampires who lure a young man and make him into a half-vampire before he is eventually "cured" (Near Dark (1987) and The Lost Boys) feature a son of Jason Miller in their casts: Joshua John Miller is in Near Dark, and his half-brother Jason Patric is in The Lost Boys.
In the movie "Lethal Weapon", when Murtaugh and Riggs are walking down the street discussing how Murtaugh owes Hunsacker, a movie theater's marquee displays "Lost Boys: This Year's Hit". Richard Donner directed "Lethal Weapon" and produced "The Lost Boys". Both were both released in the same year.
In the opening sequence there is a random crowd shot that includes an older man in the distance with thick glasses wearing a Gothic looking hooded black robe. While his appearance is in line with the "spooky" factor of the film, he is in fact a semi-nomadic Christian.
David' (Kiefer Sutherland) is impaled on a pair of antlers and doesn't disintegrate like the other vampires. Despite what Max later says, he is not really dead. This was intended to be picked up in the sequel, "The Lost Girls", which was scripted but never made. In the Wildstorm comic's mini-series "The Lost Boys: Reign of the Frogs" (2008) - which helps bridge the 20-year gap between films - it's implied that 'David' not only survived the impaling but went on to create 'Shane' the head vampire in Lost Boys: The Tribe (2008).
The movie didn't originally end on a joke. After the scene with Grampa at the refrigerator, it was supposed to cut to the surviving Lost Boys regrouping in the sunken hotel. The last shot was of a mural on the wall, made in the early 1900s, with Max in it - looking exactly the same as he did today. All of this appeared in an early draft of the script, but ultimately was never filmed.
When Max first arrives at Sam, Lucy, and Michael's house for dinner he does not enter until invited in by Michael. This is in accordance with the conventional wisdom that vampires must be invited in before they can enter someone's home.
During the climax of the film, Edgar Frog states that "when a vampire bites it, it's never a pretty sight. Some yell and scream, some go quietly. Some explode, some implode, but all will try to take you with them." All the vampires follow these four deaths exactly. Marko when staked by Edgar screams as he dies, Paul dissolves in a bathtub of holy water causing the plumbing in the house to implode on itself, Dwayne and Max blow up and David dies very quietly and with minimal struggle.