Questions
The idea of mailing the letter at the post office doesn't make a whole lot of sense, it seems to me more likely the thing to do would have been to put the letters into the desk for them to reach her, since that is apparently where the portal exists... although, one might imagine the desk portal only goes one way.
Also while Liz is supposed to marry some guy, the family never wonders why she is waiting at the station to see off Caleb?
Also, he is going to leave his fiancee in the real world, for a woman he can never be with?
Ultimately the movie is about Soul Mates... two people fated to find each other life after life after life gone by... and how that simple tether binds them across time and space for eternity...
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