Trivia: Director Jason Reitman is the son of Ivan Reitman, director of the original "Ghostbusters" and "Ghostbusters II." As a child, Jason actually had a cameo in "Ghostbusters II" during the birthday party in the beginning. (He's the kid who tells Ray he heard the Ghostbusters were "full of crap").
Trivia: Part of the reason a third "Ghostbusters" movie wasn't made in the 90's or 2000's was because Bill Murray didn't really want to return to his role of Peter Venkman. It was even rumored that Murray would immediately shred any "Ghostbusters 3" scripts that were sent to him. After many months of speculation, it was finally reported that Murray agreed to reprise the role in this film, alongside many other original cast members.
Trivia: Originally, sequels were planned for the 2016 "Ghostbusters" reboot. However, when the film attracted some controversy and fell short at the box office, plans for the sequels were abandoned. Eventually, an idea was hatched for a direct sequel to the original two films, which became "Ghostbusters: Afterlife."