Is there an offical term in literature for when the narrator of a story address the audiance in a more casual way than normal.?

I know some Dean Koontz novels do this, and I just finished reading a novel where the author is kind of telling the story as if he or she were recollecting it to us personally. Using phrases like, "but we'll get back to that later," or "Now, I probably don't need to tell you, it's been in the paper and on the telly for sometime, but ten years ago," and etc. "I can't remember if Lucy had 8 or 9 kittens, and I am not exactly sure which litter number this was at this point. It could have been her 9th litter for all I know,." I know it's not like a 4th wall breaking that we'd get in movies or comics, but there has to be some kind of literary device title for this.