Probably the same way..
They probably got permission the same way Saturday Night Live got permission for "Delta Delta Delta can I help ya help ya help ya"
That is, they didn't and they don't have to. Parody.
Although, that rule only applies to things that are copyrighted, I don't think it applies to trademark. So, if the use of "Kappa" in the movie would "confuse and mislead the public" then they might have a case that the movie studio misused a trademark.
Hmm. Now I have to go watch the movie....
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