As said above, carbon ceramics offer the greatest weight save. Likely followed by carbon roof, manual seats, and not ticking the audio box. Other carbon components and alcantara are also weight loss, but mere ounces here and there. Spoiler is tacked on, so a weight-add even though probably not much.
Carbon fiber is very light, will make other traditionally lightweight components feel heavy, such as aluminum, magnesium, or even plastic. Of course if there's a carbon overlay that's a weight-add, however I can't imagine Acura would do an overlay on the roof, especially considering cheaper cars feature actual carbon roofs e.g. M3. Alcantara will be substantially lighter than leather and slightly lighter than most cloth but that's not a lot of weight to begin with, perhaps a couple pounds vs leather over an entire interior. But the fact that Honda doesn't go out of their way to advertise weight savings means most of these carbon and alcantara options don't add up to much.
To get a good idea of how little things can add up, lookup McLaren's press release on the 675LT which talks about savings down to ounces for various items. Porsche also often discusses weight savings of particular options in a lot of their literature.
No matter how you cut it, these cars are all going to be pretty heavy. A no-spoiler, carbon everything, alcantara everything, manual seat, base audio car might come in at 100lbs less than the heaviest spec. Definitely noticeable but not earth shattering. Hopefully the Type R will bring a few hundred pounds of savings whenever it hits, likely through a much more spartan interior, lightweight bucket seats, more structural carbon, lighter wheels, etc., perhaps even going without the hybrid system.