A dent is a distortion in a surface, and a distorted surface bends whatever it reflects. In daylight a shallow dent can nearly disappear; under a straight reflected line it is unmissable. That is why the angled photo is the one that matters when you text an estimate request, and why these clips are filmed with the camera moving along the panel rather than pointed straight at it.
It also explains what is not visible here: nothing was added to any of these vehicles. No filler, no primer, no paint. The finish in every after frame is the one the factory cured, which is what keeps the car off a vehicle history report and invisible to a paint-depth gauge at trade-in.
Some vehicles below are described by type and color rather than by make and model. That is deliberate. Where the make was not confirmed at the time, it is not guessed at here.