Don't forget the paradox of the paradox of intolerance (a.k.a. the meta-paradox of intolerance) which states that Popper's paradox of intolerance is often cited by those seeking to justify their own intolerance, ironically identifying themselves as also among those whom the paradox of intolerance warns against.

(I jest but, in seriousness, always remember that Popper's paradox works as a justification for any side and any viewpoint, whether good or bad. That's why it's a weak argument.)