The red bruising effect that happens when Tori and Uke collide bugs out when using Shift-P to go through a replay. Instead of slowly disappearing over time, Shift-P makes the bruises stay as long as you keep skipping frames.

An example of this can be seen in this replay. If you press P at frame 270 and then Shift-P to frame 244, the neck breaks upon ground impact. However, if you press P between frame 250 and impact, press E and space onwards, you get no dismemberment.

This bug has been around since as long as I can remember, and doesn't particularly mess up game play, just be sure to edit your games right and it isn't a problem.

It's a big problem for records. I've always just kind of assumed that full dm replays were glitchy because they almost always have one or two dms that doesn't check out. Even my own, which I know aren't faked. Due to this glitch, almost none of our full dm replays are legit because we've all edited them so precisely, using shift+p.