Many moons ago, when I did my PPL, it was with a club where the aircraft maintenance standard was such that the examiner refused to fly in the bulk of the fleet. Fortuitously, perhaps, the club is no longer with us.
As a result of the Examiners "lack of faith" there was one C152 that was reserved for flight tests and was known, perhaps unsuprisingly, as "The Examiners Aircraft". Inevitably, the first time (and only time) you flew this aircraft it was on your flight test. Equally inevitably, this example of Cessna engineering was the newest aircraft on the fleet, was fully carpeted and with spats (both absent from the rest of the fleet). Worse, the radio was newer than those in the rest of the fleet and was manufactured by a different company.
I was lucky, I was allowed to do a few solo circuits in the aircraft before meeting the Examiner but for most, the question of "how do you turn the radio on in this aircraft?" was probably reasonable!