From SPARTACUS & THE TEN GLADIATORS, we see the ten gladiators on a hillside. If you notice Dan Vadis is wearing his usual white wrap and Pietro Torissi is standing on his right. Notice how everyone is barechested.
In the next shot Dan is now wearing a pitch black tunic and Pietro is nowhere to be seen. Also, not everyone is barechested. All ten men jump off the hill/cliff.
Then in the next shot, after jumping off the hillside, Dan is back wearing his usual white tunic.
This scene always makes me laugh. The effect is so startling, one wonders who was doing the continuity.