During the opening credits, we see a newspaper article. The visible headline says "Boy Physician," and the article tells of a boy of 15, Sebastian Roget, who is the youngest student ever admitted to Oxford, and only 2 years left of schooling before becoming a doctor. The wording of the article takes place in the present tense, while Dr. Roget is still a teen, however the photo in the article shows Dr. Roget as an older man, with crows feet wrinkles around his eyes.
In the museum, when Kathy Jacquard meet Brian Wright and the camera starts to go around them, the cameraman is reflected in the the old underwater helmets.
At about 29:13 a cross on the floorboards used for blocking a scene so an actor can hit their mark is seen. This mistake is mentioned on the audio commentary.
The nurse tries to see in the dark by using the flash from the camera on her iPhone. The iPhone has a feature that lets you keep the light on as a flashlight.