[enumerated]

The r sound is only used when there is no r in the word.

Example: JFK used to pronounce “smart idea” as “smaht idear”.

The one that bothers me most is “I couldn’t care less” being replaced with “I could care less”.

It also bothers me that everyone answers “sure” when asked if they would mind something - when they mean the opposite.

I also hate “bring” and “take” being mixed up, or “come” and “go”.
Or using “anymore” when there is no implied negative.

[Sirius Lee]

Or my favorite, say "rather".

Limey: "Rathah."

So you can pronounce R's, but you're just too lazy to finish the task at hand.