Other mistake: In the scene towards the beginning of the movie where Meg Ryan is at Starbucks, we see her order, wait briefly, then the coffee is given to her. She never pays for the coffee. (00:16:55)
Other mistake: In the opening scene, where Tom Hanks is in his kitchen fixing breakfast, narrating his email to Meg Ryan, he says that his dog Brinkley prefers to spend all day sleeping on a green inner tube (doggie pillow). But when the dog is seen curling up on his special "Brinkley" pillow a few seconds later, the pillow is blue. (00:04:45)
Answer: Beneteau.