Continuity mistake: When Kinderman connects the murder victims to the case in the first movie, he says that the African American kid was the son of the the woman that figured out Regan was speaking backward English. Only when you watch the first movie, the person that figures out what she's speaking is a man that is Caucasian.
The Exorcist III (1990)
Ending / spoiler
Directed by: William Peter Blatty
Starring: Brad Dourif, George C. Scott, Ed Flanders, Jason Miller
As Kinderman's daughter is about to be decapitated by a possessed old woman, Father Morning arrives at the hospital where Patient X (former Damien Karras/Gemini Killer) is, and the decapitation is stopped.Father Morning performs an exorcism, complete with snakes, fires, and exploding bible, to exorcise the "Legion" of demons trapped inside Damien's body. But the priest is not quite successful and is nearly about to be killed when Kinderman enters the room. He too is nearly killed when, with the help of the Damien Karras' spirit urging him to "kill me now!", Kinderman uses his gun and shoots. The "Legion" is exorcised, but Damien Karras is finally dead, for good. They bury Damien Karras' body.
andrejtu
More mistakes in The Exorcist III
Father Dyer: May the schwartz be with you.
Trivia: Director William Peter Blatty wanted to title the film "Legion" after his novel the script was based on, while the studio (understandably) wanted to call it "The Exorcist III" for brand-recognition reasons. Blatty absolutely hated "Exorcist II: The Heretic" and felt that the title "The Exorcist III" would suggest this movie followed that one, so he countered by suggesting they title the film "The Exorcist 1990." The studio eventually won out and went with "The Exorcist III."