Canadian French, or at least what's spoken in Quebec, is thought by many as being truer French that what is spoken in France. People in France probably disagree, though.

Roger knew/knows French, at least restaurant-level french…maybe something he learned in high school or earlier. He has used it sporadically throughout the series.

I'm choosing to suspend my disbelief on this one. Pete seems similar to me in that setting means almost as much as anything. Their move to the suburbs was a big factor in his divorce, I think. Pete lived his whole life as a creature of his city; his family were the original Manhattanites, even.

I've always felt Pete did love her, but when marriage wasn't the ideal he expected his immaturity got the better of him. First in little spurts, like with the german au pair over the summer where he truly felt awful and got forgiveness from Trudy, and then eventually full speed towards divorce.

"Kind of like how Peggy took a look at her own child and decided he or his human right to a meaningful relationship with his parents and origin didn't matter when she abandoned him in Season 1."

I don't think it's worth searching for motives or carefully considering Harry. I have a feeling he's simply always been —or became long ago— a second-class character, if you will. Even though he's been in a lot of stories, he's never truly important or studied.

Both those examples are too harsh on him I think. (Not that I like him as a character; I don't think he's ever been necessary. I'd rather they kept Paul Kinsey around.)