When the initial murder takes place at the subway station, the victim and shooter have the wall to their right and the posts and train to their left, with the shooter between the victim and the wall. When the murder is shown again on surveillance, the relative positions are the same except that the shooter and victim are facing the opposite direction, with the wall on their left and the posts/train on their right.
When Morgan is talking to Prentiss after the NYPD Detective was shot; his earwig transmitter changes positions several times.
Son of Sam didn't target a specific type of victim, this was a story made up to prevent mass panic at the time.
SoS shot men and women, alone or in pairs, in cars and in their own front yards. One victim was shot while walking home alone. The dog he believed gave him his orders showed no preference for a specific victim type.
Garcia tells the team that video analysis reveals the unsub to be "5 foot 9, 5 foot 10 tops" when the image on her screen clearly indicates 5 foot 10.5 inches (5'10.5")