Answers:
i think they mean don't want to confuse it.
they dont want to confuse anyone or do something wrong or unexpected. however, a definiton is -
to do something unexpected to stimulate or influence a situation in a beneficial way (informal)
encarta.msn.com/dictionary_/mi...
In that context, with those surrounding words, 'mix it up' means getting it wrong.
In other slang use it means putting your words out there to be 'stirred in' with the other people's talking, 'mixing it up' by being more social.
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