Carl saying those words at random in the middle of a session doesn't suggest in any way that it was a thing he would re-record as part of the actual song. It's just, like... him muttering something between takes. All of them mutter a whole lot of things between takes.
I suppose. Im not gonna die on the hill that "that was for you, punk" is definitely a vintage spoken word insert, but I don't think it should be absolutely discounted either. It would be a weird thing for him to say unless "in character" as some kind of gunslinger even if it's improvised. Also, Brian says there'd be talking in the cuts and we only have one official instance of it as-is, which begs the question what else he had in mind. Well, here we have another spoken word bit, same amount of syllables, sounds like something a cowboy would say to a rival...it's definitely a big coincidence if they're not related. This is, at the very least, the most plausible candidate for another spoken word insert we've heard.