I like words. I sometimes notice others' errors in usage. I usually don't point it out to them. But, Brandon Flowers of the Killers, it is "once in a little while," not "once and a little while."
We all have idioms particular to ourselves - phrases we have attempted to copy from others at some point, and somehow we didn't quite get it right, yet we continue to repeat it in our own manner. Having an understanding of the etymology helps sometimes.
[Common Errors in English Usage]
But please don't stop writing songs, Mr. Flowers, the Killers have created some wonderful songs.