Doutor Estranho

Rachel McAdams' startled reaction in the broom closet was genuine, since the mop handle fell completely by accident, and scared McAdams almost out of her skin. Scott Derrickson decided to keep the reaction in the film, since she never broke character.

(at around 4 mins) After going through his clean up routine, Strange attaches his own mask, breaking aseptic protocols. In fact, a surgeon would put on his/her mask, then scrub, then have the OR team gown and glove him/her. 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. In addition, while he is removing the bullet from the patient's brain, he and Dr. Christine Palmer are shown intermittently with scrub masks and without.

There is a message at the end of the credits warning viewers to not be distracted when driving. This is a reference to Dr Strange's catastrophic car accident, but it is also a running gag in the film about essential warnings appearing after (not before) instructions.

Edited into Thor: Ragnarok (2017)