I'm not even going to touch the Plark proposal to fLois. She's a married women already. She can't get married again, that would be bigamy.
I have to admit, I never even considered this. It's an interesting variation on the "If a tree falls in a forest..." riddle. If a woman remembers a marrige that hasn't happened, is she still married? Interesting. To be honest, I had just assumed that, if the switch is not reversed, Flois and Plark would naturally marry. It never occurred to me to consider this bigamy.
Edited to add: Maybe Lois could consider it a "renewal of her vows" ceremony?