Continuity mistake: When Ray places the silver garbage can at the curb, he places it parallel to the other cans, but in the following shots they form a triangle. They also change position, such as the blue recycling can being directly in front of Tim's back car, yet when Robbie gets out the can is far enough away from the car to allow the back door to open freely.
Revealing mistake: While tossing a baseball with his son, Ray calls him a "dick." If you look at his hand at that point, one can notice that his hand is closed in a fist, and he is not holding the baseball he is prepared to throw.
Continuity mistake: In Boston, Ray and Rachel discover dead red weed on a statue. If you look behind them, you can see a space between two buildings that is clear, only sky. In the next shot, when the crashed tripod is being shown, the spot where there was just sky now has the tripod legs. Compositors forgot to add the tripod in the previous shot.
Continuity mistake: When Ray and Rachel crawl under the kitchen table during the lightning strikes, in the first shot Ray's entire body is behind the leg base, yet in the next shot his arms and upper body are in front of it.
Continuity mistake: In one of the earlier scenes where they are in the dad's house, just before Rachel tells Ray that Robbie took the car, Rachel is slouching on the couch with her left leg crossed over her right. In the next shot she is sitting up with her hands on her face, and now her right leg is crossed over her left.