Factual error: 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.
Continuity mistake: In the first Avengers briefing with the Secretary, the shot has Tony Stark sitting in the back with a wedding ring on. The shot changes to another view and Tony is sitting in the same location, but is no longer wearing a wedding ring. This continues many times within the scene.
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