Kaecilius: You'll die defending this world, Mister...
Dr. Stephen Strange: Doctor!
Kaecilius: Mister Doctor?
Dr. Stephen Strange: It's Strange!
Kaecilius: Maybe, who am I to judge?
In the first scene where Dr Strange is preparing for surgery he uses improper surgical gowning technique breaking aseptic protocols. Strange puts on a mask after washing his hands, contaminating his clean hands by bringing them in proximity to the non-sterile environment of his face. Surgical masks must be worn before the full washing of hands. Another error is that he inserted his hands all the way through his gown to don gloves. Hands must never leave the sleeves and gloves must be put on with the sleeves still covering.
Mid credits scene: Thor pays a visit to Strange to help with Loki and find Odin. This scene takes place in the upcoming 2017 Marvel film Thor: Ragnarok.