Oh SVS was the one that used "clip residue". I believe Kayla (aka pixie on acid or pixie) coined it. It was when you accidentally leave a few frames of the next clip and you see a little flash in the final product or you leave too much of the clip over hanging and it's like there's another image there for a bit, but it's overlaying the next clip.

I used to just call it a flash or an overhang. But clip residue caught on big time at SVS (Supernatural Video Station). Poor forum went poof a couple of years ago, but now there's ETV (Expanding the Verse (http://expandingtheverse.com/forum)) and most of the people that hung out in a big way at SVS moved to there, so terms live on. :)