When Rizzoli, Korsak and Isles are reading the type writer ribbon at about 38 all the letters are in proper order. However, a type writer ribbon moves from left to right when typing, so all the words should have been spelled backwards. Example: when they read the ribbon left to right (the normal way) the word 'turkey' would have shown up on the ribbon backwards as 'yekrut'.
Solving the murder hinges on reading characters from a carbon-film ribbon purportedly used in the murdered author's typewriter. Problem is, this type of ribbon was introduced by IBM with its Selectric typewriters, c. 1961, whereas the story specifies that the author's machine was from the 1930s. No old manual typewriter could use a carbon-film ribbon, being entirely different in construction from the reel-to-reel cloth ribbons used in older machines.
Dr. "Know-it-All" Isles uses the term "hung" with respect to the deceased. The correct term is "hanged." The erudite doctor would be expected to know this, inasmuch as she constantly corrects others in far more trivial errors.
During an autopsy, Maura refers to the C2 "pedicles." Although in the strictest terms, "pedicle" can be synonymous with "peduncles," its common scientific usage refers to botany. Most medical professionals who deal with human anatomy use the word "peduncles."