Inconsistencies in the letter were first noticed by Dannielle Blumenthal PhD (@DrDannielle on Twitter). I have conducted significant additional analysis (see below) and included the problems noticed by Dr. Blumenthal. In total, there are now fourteen errors or problems in the "Dr. Ford" letter that indicate it was not authored by Dr. Ford.
Both Dr. Blumenthal and I are imminently qualified to assess the writing level and composition of letters and articles. Dr. Blumenthal has a Ph.D. in sociology and a bachelor's degree in interdisciplinary studies with a focus on creative writing (h/t to The Gateway Pundit). She has been a professional writer for 30 years and spent 2.5 years handling constituent letters sent to members of Congress. For my part, I have a bachelor's degree in interdisciplinary studies with a focus on technical writing.