I've seen the disconnected filiment thing happen in sealed beams several times; not just in old Bugs either. It can happen in anything with the old sealed beam headlights.
The license light is probably a corroded connection somewhere in the circuit. Look at a wiring diagram and trace down all the connectors, unplug them, clean them, make sure they are tight when you plug 'em back together . . . and dab a little dielectric grease on them so they won't corrode . . . at least not for a decade or two.