When the x-ray machine is used, the plates are examined immediately after the exposure without any development or fixing of the image. Exposing the x-ray plates to light like that would ruin the images in reality.
When Dr. Ogden and Murdoch are examining DeWitt's body, if you look closely you can see DeWitt's chest moving up and down though he is supposed to be dead.
The dinosaur skeletons seen in the museum are posed according to 21st century theories--bodies parallel to the ground, legs tucked under body--rather than 19th century theories--vertical posture and legs splayed to the sides.