I just don't understand why it would have been authenticated and played tonight if there are seemingly simple to notice mistakes such as spelling. I look forward to more analysis.
The thought occured to me during my commute home. Some of the most obvious things can be hidden in plain sight. Take for instance the Rathergate memos. The error was in plain sight. I this tape, the English speaker would have attracted the most attention - out of the ordinary - thus garnering most of the attention. The Sahab markings and rest could be cosmetic as the most intense examination would be on who the speaker was and what he is saying. Kind of like a sleight of hand trick too, misdirect one's attention to what you want them to see.
Now the only thing left is how it got into ABC's hands, particuarly in view of the CSM article.