Revealing mistake: There are several scenes Meg Ryan and Tom Hanks' computers do not have any telephone wires attached to them. They are in an era where they were using AOL dial up, as heard by the connection. They were not using wireless.
Revealing mistake: When Fox is on the boat with his dad, there is no rocking happening. It's as if they are on dry land when they are not supposed to be.
Revealing mistake: When Kathleen leaves Joe on the street and goes home to get ready to meet NY152 in the park, she uses her key to unlock the deadbolt; you can hear it click. But the place where she puts the key is a flat, blank space on the door; there is no key hole.
Answer: Beneteau.