When McGee and Tony are in the car you can clearly see that they are not driving and being towed instead, plus the green/blue screen out of their car windows do not match up and in parts is jumpy.
As Abby identifies Lee Varon in her lab with her back to the camera and Tony staring at her on her left, a crew member in a red shirt and glasses can be seen over her right shoulder.
When Gibbs is in the wounded man's house, crew is visible in the mirror.