This was some thread to read through.
I just wanted to add in here words from Sondheim (I believe he said it in Six by Sondheim, and I'm SURE it was in one of his two lyric books somewhere) - and I'm paraphrasing, but...
Lyric writing is not like poetry. The listener has to get it in the moment as opposed to poetry that can be reviewed and analyzed. If a listener can't get it in the moment, then the lyric is lost and can set the listener off.
In that context, does it matter if he used "career" or "careen"? If it scans, I'd argue that it doesn't matter at all. "Career" actually SOUNDS better than careen in that context.
The one lyric that always stood out to me, pointed out by a college professor I had, was in Little Priest:
"Here's a politician so oily
He's served on doily
Have one.
Put it on a bun
Well you never know if he's going to run"
Politicians at that time in England apparently didn't run for office - they stood for office. Minor complaint, but ever since my prof pointed that out the lyric has rubbed me the wrong way.
Hi, Shirley Temple Pudding.