Narrator: T-REX IN: MISTAKES WERE MADE
T-Rex: What?!

T-Rex: No: no mistakes were made!!

T-Rex: Things are good, and I'm not in the business of making mistakes! EVERYTHING'S FINE!
Dromiceiomimus: Hmm... "Mistakes were made" - past tense.
T-Rex: Oh no - it's saying I've made past mistakes and didn't even NOTICE?!
T-Rex: Unnoticed mistakes are the worst KINDS of mistakes!!

Utahraptor: And it's "mistakes" - PLURAL!
T-Rex: That's WORSE!

T-Rex: Frig, my entire past could be one huge mistake!
Utahraptor: No, T-Rex, it can't - because one huge mistake is singular, and this is plural! So, silver lining is at least ONCE in your life, between two larger mistakes, you did, briefly, do SOMETHING correctly.

T-Rex: T-Rex In: I Did Something Right Once!
Off panel: I don't think you can just name things like that.
T-Rex: T-REX IN: I DID SOMETHING RIGHT ONCE AND THAT HAS TO COUNT FOR SOMETHING!
T-Rex: T-REX IN: PLEASE REMEMBER THAT RIGHT THING I DID, EVERYONE