In the scene where Doctor Strange is about to operate on his sister, his eyes change from green to brown and then back to green as the scene progresses.
Gina's nail color changes frequently, often several times within the same scene.
When Strange is forced to write a check to pay an outstanding bill, the appearance of the characters on the check does not match the movement of the pen.
What witnesses saw Strange crash? It was midnight and the road was completely empty. The only ones around were the ghostly children.