I like the poem, and I'm sure half the references would fly over the heads of the parents too.
It has a lot going on, and a lot of interesting lines to lead to further study and educational reading, a better understanding of social culture, etc. Who were the Light Brigade? Why was Kings Cross worse than Euston? Who were The Quarrymen? I think it's very good, and certainly stuff that can be dealt with in an age appropriate way. And as for the Sodomites, I think that it serves as a useful reminder that the Bible isn't all love'n'light (and Sodomy isn't just about anal sex).