When looking at the victims X-rays, Bones uses a chest X-Ray that has fully expanded lungs that could not have come from the victim in the state she was in.
When Angela and Hodgins are looking at the ultrasound of their baby and are interrupted by Clark, they go to look at the baby one more time. When they do this, there is no sign of them using ultrasound gel. Ultrasounds require a conduit between the skin and the machine, usually a water-based gel.