In the final escape scene, Roger and Judy scale the high wall by grabbing the barbed wire running along it. When Roger falls over the wall, we see no visible means of scaling the wall from the outer side, yet he is somehow able to climb back up to the top to rescue Judy.
In Italian version at the beginning of the movie the characters talk about a party for "Carnevale", while later in the movie when they're going inside Hull House, they talk about "Halloween" or "Ognisanti".
When possessed Frannie and Max come out of the coffin they're both naked, but at the end of the movie they're wearing clothes again. Since they're possessed, it makes no sense for them to put on their clothes.