As I understand the exemplar-obtaining procedure, Arndt would have first dictated the ransom note to Patsy who would write it down. No hints about spelling or punctuation would have been given. After that, Patsy would use the copy she had just made to generate further copies.
Patsy apparently had two exemplar sessions, one in January and one in February. After the January session, her lawyers were given a copy of the ransom note. (I don't know if the ransom note was dictated in the second session or not. Patsy probably had it pretty well memorized by then.)
The sentence "Speaking to anyone about your situation, such as Police, F.B.I., etc., will result in your daughter being beheaded." has some complicated punctuation there in the middle. Patsy's first exemplar in January, done from dictation, gets it all exactly "right" although she doesn't capitalize police. (She does capitalize police her third time through, but by then she's removing the periods from F.B.I.)
Following McMenamin's chart:
RN: situation, such as Police, F.B.I., etc.,
January session:
Patsy 1: situation, such as police, F.B.I., etc.,
Patsy 2: situation, such as police, F.B.I., etc.,
Patsy 3: situation, such as Police, FBI, etc.,
(Patsy's lawyers are given a photocopy of the ransom note after the January session.)
February session:
Patsy 4: situation such as police, FBI, etcetera
Patsy 5: situation such as police, FBI, etcetera,
You can see that after Patsy's given a photocopy of the ransom note and been coached by her lawyers, she's putting as much daylight between her writing style and the ransom note's as she can. (She can't plausibly leave out all the commas.) Why is she suddenly writing out et cetera? It's not natural to her and she knows it's not what's in the ransom note. That shows consciousness of guilt.
She also eliminates her manuscript a's in the February session, and the exclamation points she had been putting in (correctly) even though all parties to the process must be well aware that she's had many good long looks at the note.
(McMenamin's word-processed charts aren't always accurate. His errors seem to break Patsy's way. We can see from a photograph that she wrote "un harmed" on her second pass in February. He says that at her first pass in February she writes "10 a.m." From a photograph we can see she actually has written "10 A.m.")