When Aubrey visits the deceased college professor's residence, he is wearing his FBI credentials on his belt with the badge facing outward. Aubrey introduces himself to the professor's neighbors, shows them his credentials, then returns the wallet to his belt - but with the ID card facing outward (not his badge). In the next scene, however, his badge is once again facing outward.
Brennan notices a bone graft on the mandible and says a DNA test is required to identify the cadaver it came from. Cam is able to easily identify the source. In other episodes they say they cannot do an identification from DAN unless they have flesh. Why is it possible on a tiny graft then?
Cats can't taste sweet.
The Bewick's wren, although still fairly common in much of western North America, has virtually disappeared from the East. However, the rarity of the bird and its endangered status in Maryland is part of the plot.
Hodgins draws blood from his own arm without using a tourniquet - highly improbable.
Dr. Saroyan says that the victim was biracial, in an attempt to help Angela come up with an identity for the remains. While the femur was noted to be Negroid [sic] by Bones, Cam doesn't say what the other race might be.