on Writers Helping Writers:
Author Intrusion happens when the author butts into the story to address the audience directly, interrupting the character who’s supposed to be narrating. Sometimes this can be used deliberately to create a certain effect. CS Lewis, Jane Austen, Lemony Snicket…it works for them because it’s purposeful. Deliberate.
As with so many writing problems, intrusion becomes an issue when it’s accidental—when we, the author, meander outside of our character’s viewpoint and start sharing things the character wouldn’t share. For instance…
Chris The Story Reading Ape's Blog 