PG-13 Color 108 Minutes. Widescreen.CX encoded.Digitally Processed.LOVE LETTER - DVD MovieIts ads portrayed it as a wacky farce, while critics largely ignored it, presuming it to be a vanity project from Kate Capshaw (better known as Mrs. Steven Spielberg). But The Love Letter is neither; on the contrary, it's a low-key but surprisingly rich and touching film about love, illusions, and regret. Helen (Capshaw), a bookseller in a small seashore town, discovers an unsigned love letter that's fallen into the cushions of a couch in her store. The letter doesn't say who it's for, but Helen assumes it's for her and starts wondering who sent it. One would expect this to lead to a whirling comedy of mistaken identities, but after some amusing...