Reason Lestrade looks confused in season 3 teaser! He goes to take his badge out of his pocket, and it's gone. And he knows right at that moment that Sherlock is back, because he is the only person who could pull this off without him noticing.
I loved and hated this scene so much. I hated how he was yelling at Mrs. Hudson so much he was scaring at her and then yelled at her for trembling (even though the sentence was hilarious), but I loved how Mrs. Hudson pulled Sherlock's gun on him in retali