Checking on the Sierra sighting tip, Stabler whistles at the baby in the car to get her attention to take the photo. Before the shutter clicks, the baby's photo is clearly shown as already taken, but then the shutter clicks and it shows up at the precinct a few frames later.
When Ashlee points at the door and says, "She could be anywhere!", her mouth is actually saying, "She could be in there!"
The missing girl's name is established to be Sierra Walker, but Stabler refers to her as "Sierra Miller" when interviewing Maria Fernandez.