The number of Tom and Maggie's house changes during the flashbacks.
When Tom is digging, his hands are dirty. When he starts arguing with his wife and waving his hands around, they are clean.
When Tom is arguing with Maggie in the back yard, a piece of dirt on Tom's shoulder appears and disappears from scene to scene.
In the beginning of the movie, Tom is getting his little boy out of the bathtub. He sticks the towel down into the water to grab the boy, but when he brings the boy out and is drying him off, the towel is mysteriously dry.
When Tom breaks the window with a stone a Virgin Mary statue is visible behind it. The glass falls to pieces and the statue collapses to the floor. When the camera comes back to the window, Virgin Mary is still standing there, behind the broken window, as nothing has happened.
Digging in the basement he uses an air compressor when the Jack-Hammer is a Bosch Brute, an electric model.
At the beginning of the movie. Lisa tells Tom that his baby will be born in June, and will be a Gemini, like the Scottish chick in the band Garbage. Lisa is referring to Shirley Manson. Manson was actually born in August and is a Virgo.
When Tom is using the lineman's handset on the telephone pole, the leads pull out of the box while he is talking. This would have ended the call.
When Kevin Bacon's character is digging in the back yard and has to move the water hose, he turns the faucet in the on direction and then unhooks it. When he moves it to the other faucet, he turns the faucet in the off direction then tries to turn it on.
When the mother and son are walking to the cemetery, you can see the camera and lighting equipment reflected a couple of times on cars that drive past between the camera and the actors.
Lisa tells Maggie the baby she is expecting will be a Gemini, and that "Einstein was a Gemini". In fact, Albert Einstein was born on March 14, 1879, making him a Pisces.