Continuity mistake: In the scene where May McGorvey is writing the letter to Ronnie in the hospital, the two "n's" are very close together, almost looking like the letter "m." This is shown again when Ronnie discovers it in her belongings when returning from the hospital. However, when he looks at the letter on the table after doing the dishes, it is two distinct "n's."
Factual error: The movie apparently takes place in a Boston suburb, judging from the Massachusetts license plates, but, in the scene in the train station, the words "Long Island Railroad" are on a sign.
Ronald James McGorvey: She's gone.
Sarah Pierce: Who... who's gone?
Ronald James McGorvey: Mommy's gone. Mommy died.
Narrator: Sexual tension is an elusive thing, but Kathy had pretty good radar for it. It was like someone had turned a knob to the right, and the radio station clicked in so loud and clear it almost knocked her over. Once she became aware of the connection between them, it seemed impossible that she'd missed it before.