Question: Who did the demonic voice that told the priest blessing the house to get out?
Question: What is up with that pig thing in the window? Does it have anything do to do with anything?
Answer: That's Jodie. In the book and the supposed "true" story, the Lutz' daughter said Jodie could appear to her in any form he wanted, but usually looked like a pig.
Answer: According to the book (and you can take that for what it is worth), one of the characters saw a pair of glowing red eyes in a window. Later they went outside and found pig tracks in the snow. That is what this scene is trying to convey.
Answer: The answer that mentions that the pig thing in the window is supposed to be Jodie is correct. However, in the broader spectrum of things, the appearance or the sounds of animals (squeals, growls, etc.) during a haunting is supposed to mean that the haunting is demonic in nature, which the haunting in this story obviously was.
Answer: George Lutz.
How was it accomplished?