The sentence is very informal ungrammatical English. It should read: I and Jacko know different ly. In other words, an adverb should be used.
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eipjooMe and Jacko know different ... Why is the adjective “different” put after transitive verb “know”?The whole sentence is part of dialog. In dialog authors try to show us something about the characters who are speaking by using the same kind of language that those characters would use if they were real, including all the grammatical errors and slang idio