When I was a kid growing up near Louisville, KY, I would hear my Grandmother and her peers and others joke about “Mt Rainier” and as superior, the biggest, etc., as in, “Oh, it’s as big as Mt. Rainier!” This was say, c. early 1970s. Decades later I recalled this, and would wondered why people in the east would say this, particularly since she’d never gone west of Illinois in her life as far as I know.
A year or two ago, I read that until around WWI, Mt. Rainier was thought to be the highest peak in North America, and thus was taught in schools and appeared in text books. Around then, c.~1917, new surveys showed McKinley was a little taller, but it took a long time for textbooks and popular perception to change.
I found this somewhat interesting - how misinformation likely inflated it’s popular appeal, though I would not say undeservedly.
And yeah, it never gets old!