I am also posting this pic of Duane from the same day:
Description says this:
Duane at the Gibsons Landing Salmon Festival 2009. Thank you Linda Williams for taking this photo! Notice the American Flag still up even though this is Canada. I think that might also be a Washington State flag, the green one, next to it, while the British Columbia flag looks like a setting sun and the British Flag combined together. A film set prop left by the movie crew over the weekend shooting break.
And he's right. It is a Washington state flag next to the US flag. So I guess that answers the question of where the film is set. But, based on Sam's clothing, it does appear the Red Sox are still a significant part of the story.
You can check out the fish in more up-close pics on his FB. The text bubbles are sweet.