I was strolling about the Falkreath Sanctuary when I hear Festus Krex talking to Babette. He say's something like: "You mean the manor house? During the thunderstorm?"

If you've played the DB in Oblivion, this might ring a bell. Remember the quest where you had to kill all of the guests in this big manor house, and everytime you approached the house there was a script which made a thunderstorm occur? Just something I thought of. Pretty cool reference. ^.^

I would say that we've left the realm of possible and just figure that yes it is indeed a reference to Whodunnit.

Ah! I forgot the name of the quest. It must be the best quest I played in Oblivion, and it puts the DB in Skyrim to shame. I'm glad they acknowledged it.