aleph one wrote:has anyone entertained the idea that its not the fourth wall that is bleeding, but perhaps the second or third?
i'm not 100% sure we are not all fictional characters so I'm going to go dip my hand in paint thinners, if it melts then i must logically be drawn on something
I know this is almost a necropost, but whatever.
First, I'll nitpick a bit, as I tend to do.

The "second or third" walls are actual walls. The fourth wall is a theatrical term meaning that one of the walls is "transparent", and we are looking through it.
Now that that's out of the way: we have assumed that we should behave as if we are on the "top level" of reality, because otherwise Mr. A (or even regular people) could have manipulated our reality without us noticing. So there's no way for us to confirm that we are fictional, anyway. Instead of "fictional world" we might as well say "lower fictional layer", and all that would change are semantics.
And on the whole "order of appearance" thing... I don't think there's a pattern, but, to be honest, I got tired of guessing and plotting without any data. Or with. x_x Maybe I need another break.