Survey for book & seminar

I'll introduce myself first.
My name is Stephanie and I am a bookkeeper/accounting technician in Ontario, Canada. I've been a full-cycle bookkeeper for 9 years and I am
currently attending college part-time with the intention of obtaining a Accounting & Finance diploma, Honours B.Comm and CGA designation.
I am currently writing a book on small business bookkeeping I hope to self publish, but I am also working on a seminar on the same topic. By coincidence, I have a presentation to make for my effective business writing course. I have decided to cover something I was planning to write about for my book/seminar.
I would like to ask the group's accountants to please send me your best/worst examples of 1) how a small business owner's attempts at their own bookkeeping has made a mess, and 2) how someone who claims to be an experienced bookkeeper has made a mess.
I am looking for the most common mistakes, large or small, and the ones most easily avoided by having some basic knowlege of bookkeeping and its purpose.
Thanks in advance,
Stephanie Serba, ICIA Durham Business Outsource Partner, Accounting & Technology QuickBooks ProAdvisor Member, Canadian Bookkeepers Association
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