Is it just me or has that car got a pair of red breasts behind the cockpit??
What you're seeing is an ancient vestige of sports-car racing rules. In theory, every car going 'round Sebring right this minute is a 2-seater. That's why you see the double headrests. If you look closely during pit stops, you'll see that the engine air intake (and related intake restrictor) lives in the "passenger's" headrest.
For many years (and it may still be, I'm not up on the current rules) race cars at Le Mans were required to carry a spare tire onboard long after tire-changing became a pits-only operation.
At it's core, "sports car" racing still retains a idealised "gentlemanly" flavor to it; the conceit being that the car on the track should be able to be the car on the public roads. Yes, this has not been the case for a long time, but it remains part of the ethos of sports car racing.
Never ask a woman who is eating ice cream straight from the carton how she's doing.