What is with Netflix randomly censoring profanity in some episodes of shows, while leaving it intact in other episodes of the same series?
Netflix does not have an in-house corporate policy to censor anything they stream. They do have to comply with localized ISP regs, though, as a content provider. I would guess the inconsistency you have observed could be that streaming files for episodes are being pulled from separate subsets (censored and uncensored) either by accident or in a simple mix up of some kind. As it happens, I've never personally seen any episode of any TV series censored as to language while using Netflix, but no doubt that is just happenstance.
Since I'm in the US, I'd like to see if I get the same weirdness you are witnessing or not. What shows and episodes did you notice this in? Also, would another Canadian forumite with Netflix who is in a different Province check these shows/episodes as well?