- Ability over Appearance: Joel Schumacher envisioned Star as being a waifish blonde, similar to Meg Ryan, but he was convinced by Jason Patric to consider Jami Gertz, who had just worked with Patric in Solarbabies.
- Awesome, Dear Boy: Kiefer Sutherland was originally reluctant to star in the film, until he heard that Joel Schumacher had lined up INXS and Jimmy Barnes to sing some of the songs on the soundtrack. Kiefer had spent a summer in Australia when he was a child and became fans of their music.
- Dawson Casting: Ah, the antics those mid-twenties teenage vampires get up to. The Frog brothers are also three years younger than their actors.
- Deleted Role: Kelly Jo Minter as Maria was cut from the film. The only true appearance she makes is over Lucy's shoulder in the video store, yet she still received billing in the film's opening credits.
- Role-Ending Misdemeanor: Barely averted. Corey Feldman almost wasn't in the movie. At the time, he struggled with drug abuse at a young age and showed up to work coming down from a cocaine binge. Joel Schumacher was very upset that Corey kept dozing off and was unable to continue filming, so he fired him, but hired him back the next day after Corey apologized and swore to come to work prepared from then on, which he did.
- Those Two Actors: This was Corey Haim and Corey Feldman's first film together, which marked the start of the popular '80s trend "The Two Coreys" in which they starred together in a number of teenage films.
- Throw It In!: In the scene where Sam and the Frog Brothers stake Marco while he sleeps, they are pursued by the rest of the vampire gang as they try to escape back into the daylight. David grabs Sam's leg but Sam manages to drag David's hand into the sunlight where it catches fire. A tear then slides down David's face as he clutches his hand in agony. Apparently, the tear running down his face was actually caused by Kiefer Sutherland's contact lenses which were stinging terribly, but they decided to keep it in as it looked really good and was in context.
- Unintentional Period Piece:
- The fashions are aggressively 1980s. The Lost Boys have hair metal-inspired costumes, and Michael gets one ear pierced with a dangling earring in an early scene. Sam also wears a gold stud in one ear and some incredibly colorful, baggy shirts that even other character remark are gaudy.
- Lucy gets a job working at a video store renting out VHS cassettes. Not much job security there.
- There's a conversation about TV Guide, a relic of the days when you needed a published programming listings to know what was going to be on television. Sam is confused by Grandpa reading it, since he doesn't have a television, making it useless. Modern TV Guide is more like a magazine with articles and would actually be more useful for Grandpa's intended use.
- Tim Capello's shirtless saxophone performance is treated as the hip sound of teens and headbangers.
- What Could Have Been:
- Believe it or not, according to the director's commentary in the DVD Bonus Content, the original script for the first movie was written for a G-rated film with most of the main characters being children Laddie's age. The Frog Brothers were going to be somewhat chubby Boy Scouts, and Michael was apparently going to be about thirteen years old. Basically, it would've been a Grimmified Peter Pan, right down to David and Star's characters being named Peter and Wendy. Joel Schumacher described it as Cub Scouts turned vampire. This is also the reason for the whole "boys need a mother" bit at the end, which in the released film just comes off as Max being insane.
- Executive producer Richard Donner originally intended to direct the movie himself, but as production languished, he moved onto Lethal Weapon and eventually hired Joel Schumacher for the job.
- Keenan Wynn and John Carradine (a veteran of vampire films) were both original choices for Grandpa. Wynn died right before filming and Carradine was too ill.
- Jim Carrey was considered for David.
- Ben Stiller auditioned for a part.
- The reason David's skeleton didn't turn to dust at the end of the original film after being impaled on a pair of antlers is because he doesn't die. This would have been picked up in a sequel, called The Lost Girls. Scripts for the film circulated in the early '90s, but the film was never made. However, the plot point would turn up in the comic book Lost Boys: The Reign of Frogs.
- The two alternate endings to Lost Boys: The Tribe featured Sam Emerson arriving in Lunar Bay and warning Edgar that a head vampire was heading to Lunar Bay to settle an old score with him, before offering to help Edgar, since once Edgar died, he would be next. The vampire was revealed to be Alan, Edgar's brother. The two endings are largely the same, only in one ending, Sam is far more serious than in the other, since he'd already been bitten.
- Corey Haim stated, after production started on Lost Boys: The Thirst, that he wasn't going to be involved in the film, but that he would return to the series in the fourth film. This was later confirmed by Feldman and Newlander. Unfortunately, Haim died in March 2010.
Trivia / The Lost Boys