My focus wasn't on any grammatical or spelling erros. It is the note as a whole which is just plain incoherent.
It starts off formally with "Mr. Ramsey", but gets more and more personal as it proceeds, calling Mr. Ramsey "John", insulting him: "don't try to grow a brain" (a line from a movie), and to "use his good southern common sense".
The note ends with the totally ridiculous "It is up to you now John!" LOL, the RN author sounds like a quiz show moderator asking the candidate: "It is up to you now, Mr. Smith: "Do you want to answer the million dollar question or not?"
In short, the RN author was not able to stay focused, but got carried away, deviating from her "small foreign faction" overture as she wrote on.
That's what I meant by 'disorganized'. There's just too much contradictory or downright silly stuff thrown into that note which doesn't make sense.
Just take a look at the phrase "you will be scanned for electronic devices and if they are found, she dies." Priceless. So the small foreign faction members were going to step out of the bushes, scanning John for electronic devices?
"A ransom note was written", you said. Yes, but what kind of ransom note was that? It didn't even specify the date of 'tomorrow'. Again, this points to disorganization due to the extreme stress of the panicked parent who wrote it. The FBI CASKU experts said that the ransom note indicated panic. Imo this panic can be felt in every single line, and can also be seen in the handwriting.
A note written in a panic (after JonBenet was dead) indicates that this was not a premeditated crime.
jmo