Trivia: When Lorraine Warren is dreaming about the demonic nun in her house, the demon actually reveals its name in 2 ways. The first is the way Lorraine realises at the end of the movie (written in the Bible). However, the audience is another way-the gold letters on the bookshelf behind her also spell out the name "Valak."
Trivia: While eating breakfast there are "letters" on the window ledge in front of Ed and Lorraine at their home. They spell out the word Valak, the name of the demon they encounter once they are in England. (00:30:30 - 00:32:00)