I like the poem concept, it\'s funny XD
I noticed that too about the poem style, that the latter half where the poem varies from the original storyline, that the language is a great deal more casual.
I think in this instance, the editor would have to make a choice - keep the whole poem a bit more lighthearted and casual in its language, or more formal all the way through.
My opinion? Formal would be funnier, though casual would be easier.