Star Wars X-Wing series - Run That Name by Ne Again?
Hobbie's last name is inconsistently spelled throughout- it it Derek Klivian, but is spelled "Klivan" in the first four books.
In "SoA", he introduces himself to a reporter, and adds, "I'll get back to you on the name- lots of people misspell it.", thus turning a slipup into an easter egg.
I've also noticed that in the 1st book: Rogue Squadron, the Gand pilot Ooryl Qrygg's name is sometimes spelled 'Qrygg' and then other times 'Qyrgg'
Actually I'm not sure if I've spelt it right...