Boy in red with hood who is haunting Kiefer Sutherland is reference to similar haunted child person (also in red with hood) who Donald Sutherland (Kiefer's dad) keeps seeing in Don't Look Now
As David Labraccio (Kevin Bacon) is about to be "killed," he says to Nelson (Keifer Sutherland,) "Nelson, don't let go of the rope." In Poltergeist, Craig T. Nelson's character is admonished not to let go of the rope while his wife passes into the spirit world.
Video box on shelf in Karl's Video Store
Father Ted asks: "Is that Kiefer Sutherland? Are you watching Flatliners?"
Donna mentions this while suggesting Travis has a thing for Julia Roberts
quoted by one of the sorority sisters
Agents Pillows and Cole agree that the movie makes no sense.
Mentioned in dialogue; Oliver Platt is attributed to working on this film.
Med students kill and resucitate each other as an experiment
Cover on shelf in 'Karl's Video
DVD is shown in Amanda's house.
Jeroen Krabbé mentions this film
Included in a $16,000 question
Included in a $10,000 question
Poster shown to describe Julia Roberts' career
After the Monarch flatlines and Dr. Mrs. The Monarch resuscitates him, Henchman 21 says, "You think he brought back any angry Billy Mahoneys"
Mentioned by Tosh
Film title mentioned when the film is compared to Soultaker.
Zippy says he "flatlines" regularly, specifically referencing this movie
The Warden is killed and revived, encountering the dead he's responsible for, as in this movie.