Only one... but it will take a few episodes. The lightbulb saga
Should it really be a lightbulb?
None, because they keep on asking why all of the other light bulbs in the house aren't being changed at the same time.
None it is done by the automatic pilot.
It wouldn't matter. Jon Snow knows nothing.
The episode.
Just 1, but It'll take 7 episodes for him to do it.