I agree. It appears bent but the video is taken through the rear window.
"Snell's law (also known as Snell-Descartes law and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing...
Sorry gotta disagree on this one. That picture is of a distorted reflection of the drop gate.
It's flat. What you're seeing is reflected lighting/image outside of the truck. Here’s another angle...