1 - I hate it when several characters in a novel have the same name. I know books like Wolf Hall can't help it as they were real people, but I'm halfway through One Hundred Years of Solitude and please, not another Jose Arcadio... There are twenty two Aureliano's! I know only five of them are main characters, but I'm getting confused!
2 - I don't like irregular page edges, like the ones on the Puffin Chalk editions and the Little Women Penguin Classics Deluxe edition. Not a good feature. I don't know the name for them but why make it harder for readers to turn the page?
3 - Trends that really outstay their welcome. For instance;
"The stamp collector of Auschwitz."
"The stamp collector's ex wife's niece, and other women who are only described in the title in relation to a man and his profession, for some reason..."
"Romeo, and Juliet the stamp collector: a Shakespeare retelling (because we exhausted all the fairytales by now we think but we're checking again, don't worry.)"