I noticed something peculiar on the elevators today...
It seems that after jumping off either of the elevators, Jumpman needs a brief moment to refresh before he can jump or move again. The delay is small, but significant in that it doesn't present itself anywhere else in the game.
The cause of this lag may have something to do with Jumpman falling further during elevator disembarking than what is common with normal jumping, though the lag will present itself no matter how straight across an elevator is disembarked, and does not present itself when boarding elevators. In other words, the only place in the game this lag can be seen is on one of the eight potential elevator disembarking platforms. You might think the lag is only seen here because there are not opportunities to fall any significant distance on the other levels, but as I said, the lag doesn't occur when boarding elevators, only after jumping off them. The only way to circumvent the elevator disembarking lag is to walk off the elevators.
Weird.