“I think routine is a thing of the past for us,” Ichabod Crane says at the start of last week’s episode, “John Doe.” You can say that again. There’s nothing routine on this show. After all the satisfying mythology-setting of the previous episode, “The Lesser Key of Solomon,” we’re back to another lunatic entry in the season. As I wrote in my previous blog entry, it seems the writers haven’t quite settled on a rhythm yet, whether in terms of tone or narrative. I can’t quite figure out whether this is a good or bad thing.