While English became the lingua franca (and I fully get the irony of using the term "lingua franca", lit. Language of the Franks, to describe English as opposed to French), the quirks of being separated by the ocean(s) is fairly minor like, the f slur referring to a cigarette in the UK vs being a... slur in the US, or trousers vs pants.

For some reason, Québécois has stayed way more isolated and thus archaic sounding compared to Metropolitan French. Not just in phrasing (Québécois has a lot of terminology that relates to the church), but also pronunciation. E.g., the the way "r" sounds are made in Québécois is actually closer to what Parisians a couple hundred years would have sounded like, instead of the "w" ish sound Parisians say now.