22: JJ2 is full of realtime lighting. Torches flicker, lights get darker when you go in caves, the water darkens in Marinated Rabbit the further down you go... there's a whole Lighting section of JCS events in Environment, after all.
34: This never made it into the final, although it's also referenced in Rabbit in Training. There was a system in place in JJ2 to give extra lives in exchange for gems, but it was taken out because it wasn't quite right and then they never put it back in in time for release.
39: You can't eat carrots at full health in 1.23, no, but in earlier versions you could, just like in JJ1. And you'd be going backwards through the level so that you could pick up those carrots, of course.