I'm playing Normal mode. I'm not sure if this is intended or not, but in Crypt 3, flipping the lever in the room at the right side of the entrance (where you look for the poem fragment, see image) to retract the spikes in that room also retracts the spikes on both sides of the room with the owl statue, effectively skipping the lamp puzzle.


(notice that the lamp is unmoved)
That's not all; flipping the lever in the room at the left side of the entrance (the other poem fragment room) also activates the rotating lights in the left room inside the crypt (normally, you would have to locate the lever in the room on the right to turn on the lights).
I apologize if this is not a bug, but this just seems odd to me.