Is there ever a "wrong mistake"? For that matter, is there ever a "right mistake"?
Adding an qualifier like "wrong" to the word "mistake" is like adding a qualifer to Unique. By definition, unique simply means one of a kind. there are no others since, if there were, then they would not be "unique".
A mistake is an unintended action, something committed in error. That is fact. However, the end result of a mistake can be beneficial due to the sarendipity factor. For example, you might say "I turned left on Rojas when I should have turned right. Lying on the sidewalk in front of me I found a 500 Piso bill that I had lost a year ago."
(No, I really don't think that a 500 Piso bill would remain on the sidewalk for a year.)
Turning left instead of right was a mistake but finding the bill was good - the serandipity factor. Regardless of the outcome, you still made a mistake.
Another prime error is the use or misuse of "can" in place of "may" The difference was drummed into me by an English teacher when I was a freshman at Pocatello High School in the early 1950's. She used a 12 inch ruler smacked across your palm as a teaching tool. It worked.
Paul Garner
aka The Old Sarge
PS: Jose, have you written recently about the proper use of Can vs. May and the continuing abuse of the word "Unique"? This is something that is common in the US.