Trivia: When Dr Strange experiments with the forbidden Eye of Agamotto and time spells in the Book of Cagliostro, he uses an apple to practice on. Apples symbolically represent Forbidden Knowledge.
Trivia: The film was shot partly in Nepal, with exterior scenes in several Kathmandu locations including Pashupati, home of Pashupatinath Temple, and Lalitpur's Patan Durbar Square, a unesco World Heritage site. The interiors of Kamar-Taj were created on a soundstage in London.
Trivia: The Mirror Dimension special effects were influenced by the art of M.C. Escher, and by fractal shapes.
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.