Audio problem: Near the end when Alex is talking to his brother on Valentine's Day, the overdubbed audio says the date is 2006 and not 2004, like Keanu originally said. His lips say 2004, which shouldn't have been overdubbed since Alex passed two years prior. (01:28:35)
Audio problem: Alexis confirms in a conversation with his brother that it's Valentine's day 2006, but if you watch his lips he says 2004.
Answer: In her apartment in Chicago. Because Alex knew her address, he hid it in the floorboard for her to eventually find. He knew how important the book was to her. He didn't want to send it to her in the mail, as she originally requested.