I guess I would say that the dissonance created in the listeners ear by the untrue rhyme, might actually accent the meaning of the lyric.

Not strictly about lyrics...

"Frost once said that whenever he came across a rhymed
poem the first thing he did was run his eye down the
right side of the poem to see who had won, the poet or the
rhyme scheme."

attributed to Robert Frost by Billy Collins (in the Introduction to: "The Stuffed Owl - An Anthology of Bad Verse"