As the tree is being cut down, the movie keeps cutting back to Camilla, showing what damage it is doing to her. When the guy finishes cutting down the tree, there is a shot of Camilla and her left leg breaks off and she falls to the ground. The two shots immediately following, of the mother tackling her and then of Camilla being thrown out the window, both show her with her legs still intact.
Sometimes the wall mural in the baby's room is the trees the mother was painting at the beginning of the movie, but in other scenes it's a bunch of flowers.
When Phil investigates the house of Ned he finds the phone hanging and swinging back and forth on its string. As the phone was dropped the night before it should have by now stopped swinging.
When Phil and Kate decide to visit Dr. Klein and drive to the hospital it is clearly day outside. When they take their son out of the hospital and drive back home it is suddenly night time.
When Phil returns home to confront Camilla about Ned, the crew are visible in the window reflection behind him.