When Sylvia Ganush attacks Christine in her car, Sylvia curses in Hungarian, "Az ördög szálljon beléd!" ("Shall the devil fly into you!") She also uses the Hungarian word "szajha" two times (the word means "bitch" or "whore" in English).
The movie begins with the 1980s Universal logo, which refers to when director Sam Raimi got started in the horror genre with the first two "Evil Dead" movies. After the credits, there is also the title card that says to take a tour of Universal Studios. This was also used in the 1980s in other Universal movies, such as An American Werewolf in London (1981).
In the movie, Shaun San Dena (Adriana Barraza) mentions her late husband Sander, a reference to both Sam Raimi's older sibling, Sander Raimi, who died in a swimming accident at age fifteen while on a trip to Israel, and his oldest nephew, Sander Rubin.
The Greek letters surrounding the walls of the Great Room (where they hold the séance) are taken from the Book of Revelation, Chapter 12. Translated they read: "And they conquered by the blood of the Lamb; wherefore rejoice heavens, woe to earth and sea; for the devil has come down to you having great wrath, knowing his time is short." San Dena paraphrases this passage in Spanish when she drives the demon from Milos. For instance, "Lo venceremos por la sangre del Cordero" means "We will defeat him by the blood of the Lamb".
When Sylvia Ganush attacks Christine in her car, Sylvia uses the Hungarian word "szajha" two times. The word means bitch or whore in English. She says it for the first time after her face has been stapled, the second time she says it right after she breaks Christine's car's window with a brick. When Christine first sees Sylvia in her car, Sylvia says in English: "You shamed me." Grabs Christine's hair, pulls her back and tells her this time in Hungarian: "Te szégyentelen", literal translation would be: "You shameless".
Sam's brother makes an off-screen cameo as a doctor. Their brother Ivan (also the co-screenwriter of this and several other Sam Raimi-directed films) really is a practicing doctor of osteopathic medicine.