Also! I assume Charles must have developed a better way to deal with Jean's Phoenix powers than the Frozen direction of "totally repress everything and hope this doesn't turn you into a supervillain!" Because even without needing to save them at the dam, some Phoenix stuff was rising to the surface.

I wonder how / why Charles got off not!heroin in the regular timeline. I suppose the same way / reason any drug addict gets clean. Or maybe the serum stopped working. (Which might also explain the permanently blue Beast in the "present", but in addition Hank could just've decided to be himself.)