When keith is showing Lucas how Brooke's life would've been if he would have been a more selfish person, brooke is seen at Peyton's head stone which dates that she died in March 1 of their senior year. However, wouldn't that only make Haley's pregnancy 3 months long? For some reason this bothers me. Also, the head stone shows that Peyton's birthdate is July 12 1988, making her 18 at the time of the shooting, but turning 19 that July. How many people do you know that turn 19 right after they graduate high school?