Plot hole: When Kate went to the aid of the man lying in the street, she was very upset about his death. Would she not have got his name being that she works in a hospital? Also she could have easily Googled him in 2006 to find out where he was or that he had died already. It seemed an obvious ending that she would save his life to change history.
The Lake House (2006)
1 plot hole
Directed by: Alejandro Agresti
Starring: Christopher Plummer, Keanu Reeves, Sandra Bullock, Ebon Moss-Bachrach
Continuity mistake: During the opening credits, Kate leaves the Lake House via the kitchen, where we see the indoor tree is branches only-no leaves. Then from her car she looks back to the house, where we now see that tree is covered in orange leaves.
Girl Patient: My mom's last boyfriend was bald. He was nice, but she didn't marry him.
Kate: No?
Girl Patient: There's always something better coming around the corner. That's what she says.
Kate: If she's not careful, she can spend her whole life waiting.
Trivia: 1620 Racine is the same block as in the movie The Untouchables. The address where Sean Connery is killed is 1634 N Racine.
Question: Why would Alex put a letter in that mailbox? Did he know this lady was going to show up?
Answer: The mailbox is where you would send and receive mail.