In The Steal in the Wheels (2017), Cam had asked Dr. Rodolfo Fuentes if he will still be attending her wedding when they were discussing him moving on, to which he replies "of course." He is not present at her wedding because Ignacio Serricchio was not available for shooting the last two episodes.
During Cam's wedding reception, when "Bones" and Angela are talking, the same bite of cake on Angela's fork appears when the camera is on her and disappears when the camera is on "Bones" (several times).
When Agent Aubrey is taking a pain pill for his hangover, he can be seen putting the pill in his mouth then dropping it into his coffee mug when he goes to "drink" it. There is also a "plink" noise of the pill dropping into the empty mug.
The United States federal government does not have a minimum age of marriage; this is set by the states. In 28 states, there are minimum ages below 18.