…about the writing of sequels.
When naming a minor character in a book, don’t give him a long and complicated name on the assumption we’ll never see him again anyway.
Because, you know, he might turn out to be a major player in the sequel and thefore need his name mentioned on a regular basis…
From now on, the only people getting long and complicated names are those earmarked for death.
(yes, I know. It’s occurred to me the dead can come back unexpectedly, but we’ll cross that bridge when it presents itself)