Cres

When the doorbell buzzes, John can immediately tell whether it's Lestrade or a client because Sherlock monologued about the differences one time when he was bored and the D.I. came in with a case.

After enough announcements from Sherlock that Mrs. Hudson is coming up the stairs, John starts to be able to identify her walking pattern.

Sherlock always pauses just outside and just inside the entrance of 221 Baker Street, quickly scanning for any signs of trouble or Mycroft's tell-tale movement of the knocker. John adapts this into his own habits after a while without realizing.

At murder scenes, after his medical appraisal of the body, John starts looking around for clues that Sherlock might find useful or at the very least interesting enough to keep him on the case. At first John has to force himself to try this (mentally chanting "what would Sherlock look for", I'm sure), but after a while of assisting the detective he slips into it without realizing.

twelve episodes, twelve contestants - a mix of annoying middle aged sci fi authors, fan fic authors and random people off the street

a variety of against the clock writing tasks, big finish scripts, ability to interact with actors without shouting at them and challenges where you have no budget or doctor for an episode

judged by solely by christopher eccleston