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.
Factual error: Shortly before the EMP bomb is activated, the crate containing it is shown. "Diese Seite Oben" is painted on the box, which is a bad translation of "This side up." In Germany crates only use the word "oben" to indicate the upper side of a box.