This seems about right:
NBC News has fired a producer who was involved in the production of a misleading segment about the Trayvon Martin case in Florida. The person was fired on Thursday, according to two people with direct knowledge of the disciplinary action who declined to be identified discussing internal company matters. They also declined to name the fired producer. A spokeswoman for NBC News declined to comment.
Accepting NBC's rationale that this this was "a mistake and not a deliberate act to misrepresent the phone call," it's still someone failing (more spectacularly) at a key element of their job. Whatever the intent, the tape actually is a misrepresentation. That's the exact opposite of what a news producers is supposed to do.
It's very similar to the Jeremy Lin situation "Chink In The Armor" situation at ESPN. That you didn't mean any offense is beside the point. I'm sure Vinny Testaverde didn't mean to throw any of those interceptions either.