I recently had a conversation with someone close to me about paying attention to previously made statements in your story.
If an author writes early on in his/her story that one of the characters has no heartbeat, for example, and is undead, then it goes to show that having that character get a woman pregnant seems a bit, shall we say, impossible, for obvious reasons that I won’t go into on this blog.
With that in mind, when I say “don’t write yourself into a corner”, I mean that if you have your character lore already set and you don’t want to change that lore, make sure that resulting situations correspond to that lore. I’ve taken that statement to heart, and I’m already going back through my story and tweaking bits that I think might cause problems later on. It’s hard work, but I feel that it will help when I’m published that my editor or fans (because I will have fans) read my book and enjoy it without ruining their suspension of disbelief.