Visible crew/equipment: When the real estate lady is showing George and Kathy the rounds of the house, the studio lights are in the reflection of her glasses.
The Amityville Horror (1979)
1 visible crew/equipment mistake
Directed by: Stuart Rosenberg
Starring: James Brolin, Rod Steiger, Margot Kidder, Don Stroud, Murray Hamilton
Revealing mistake: You can see Jackie's knuckles are already bloody BEFORE she starts pounding on the closet door.
Father Delaney: God's peace in this house.
Trivia: The image of the man that appeared in the "Red Room" was James Brolin's brother.
Question: What is up with that pig thing in the window? Does it have anything do to do with anything?
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: 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.