Guyver only has banding, hit it with flash3kyuu_deband for ease of use. Summer Wars is perfect as it is. Birdy the Mighty could use some chubbyrain2 (defaults might work, otherwise toy with it), deblock_qed(12,15) (random low values just to tell you that it needs to be used at low values), ttempsmooth(maxr=7) (these are defaults with just the amount of frames it'll check temporally maxed out) and possibly some dehalo_alpha(darkstr=0,brightstr=0.3) too. You'll actually have to adjust the values, these are only indicative as to probably what you need to use, but they'll hardly be perfect as they are. It's mostly what I see.
You don't see the grain?
Grain isn't bad, it's quite good actually. Birdy the Mighty has noise though.
The color distortion?
At most I can see rainbows in Birdy the Mighty.
I don't see even leftover combs in the screenshots you posted.
the dull colors?
Please don't ever say this, as you are not more competent than the people that made the anime. They will know which colours are supposed to be and made the anime look like so, you do not know what is right or wrong. At most you might want different colouring for your AMV, but that's you using effect and toying with it, not an actual issue to be fixed.
The only thing that could be wrong in that sense is if they encode the levels using the full range yet flagging it with the limited range, and you'll hardly be able to tell that (chances are you might like it more and think it's correct since you'll see much more contrast due to brighter and darker colours shown than they sould be).