While on the phone with the 911 operator, Sam says he is 3 1/2. While at the hospital, Benson tells Amaro that Sam is barely 4. If Sam is 3 1/2, he is younger than 4, not barely 4.
When Rollins logs onto a donor matching website, she reads a post from another child of Donor 141 who says she has met him. Following this lead, the team goes down to Baltimore and speaks to the poster (Ashley) to find out the identity of the donor. However, when the camera zooms in on the computer screen, Ashley has already identified Donor 141 as Calvin Baker.