Big Bang Theory - Car scenes and missing headrests

I have been watching Big Bang Theory from day one. Every time there is a car scene, I notice that they are using cars with low headrests or they fully remove the headrests. It looks very obvious.

I understand if you have a scene with passengers in the back and you don't have a good angle, but why do they need to remove the headrests if they have a scene with only two people in the car?

Almir

#BigBangTheory #cars #carscenes #nerd