Around 34mins, Benson puts the boy suspects photo slightly higher on the board between the photos of girlfriend and his father. After shot moves away briefly it returns to the board with the suspects photo now lower than the other 2.
The Medical Examiner states the dead girl was eight weeks pregnant, with a girl. But you can't tell a baby's gender until about week 14.
During the opening when the police dog takes a nibble on the suspect, the padded sleeve to protect his arm is clearly visible.
After watching the video of the victim and her friend, Elliot says they remind him of (his daughter) Elizabeth's friends, 'typical high school students.' Elizabeth and her twin have been said to be 10 earlier in the season, so they are no where close to high school age.