Gwen is unconscious after the observatory scene. The doctor says "Gideon, she needs you". From the wide angle, the right hand of Gwen is clean. When Gideon sits and take her hand (on the close angle) now it is bruised, and blood is seen.
(at around 1h 17 mins) Gwen takes a picture of 2 guys with her smart-phone. She uses the phone's flashlight, as the room is a little dark. These guys looks "white bright" when picture is taken.
Later, around 1:46:00, she shows the pictures to her friend : the flashlight was not used, as the 2 guys have shadows on them.