As you 'told' me on the dvd thread to post over here too, here I am!
I had read the thread before and was quite excited when I found it. I would love to discuss the parallels between 'The Lakehouse', the film, and 'Persuasion', but unfortunately it's been a while since I read the book. From what I do remember, I certainly agree with your comments, but can't think of anything to add.
I enjoyed the film much more than I had expected as I had read several bad reviews before. Didn't mind at all that it was pretty implausible, but found it hard to follow the time aspect of the story. What I liked about the film was that the reason for them not being together was time, a very abstract reason, rather than some annoying misunderstandings, unsaid things, or prejudices. Somehow there was more hope in that. And their waiting was as beautiful as Kate (Sandra B.) described it when telling Alex (Keanu) about Persuasion.
Even though I don't remember the details of Persuasion, I do agree with you in that I like Anne Elliot as the heroine. I think she's my favourite Jane Austen heroine (read all apart from Mansfield Park) because I can identify with her the best. I like all of them, but don't always understand them.