Errors in geography: When Tom is driving to the Bainbridge - Seattle ferry at the beginning of the movie (with the Mt. Rainier in the background), he's actually driving away from the ferry down a dead end road on the island.
Continuity: The stain on Tom Sanders' tie changes position.
Continuity: When Tom's wife and Catherine are walking into Pike Place Market, there is an extra with a bright blue shirt and a white beard who walks across the screen in two places.