I've never heard of a rolled error. How does it happen? Planchet meets struck coin? I would think the planchet subsequently being struck would remove all evidence of the transfer from a struck coin on that planchet. But I'm guessing.
Gold is relatively soft--I assume it's softer than Silver and you can definitely get deep reeding marks on silver dollars presumably from a drop after coining onto another coin in a bin.
I'm a big fan of the counter clash. I have an example here <https://coins.www.collectors-society.com/WCM/CoinView.aspx?sc=345619> [cut and past the URL from between the <>'s]. The description is: A Type II counter-clash occurs when a die strikes a piece of hard metal. It could be a die fragment, a collar fragment, a stray nut, etc. The initial strike leaves a die-struck design on the metal fragment. The fragment then shifts position within the striking chamber and is struck again. The second strike transfers the design back to the die face (typically just the field portion). The die face now carries an incuse, mirror image version of the design. Every planchet struck after this will have raised normally-oriented design elements in an unexpected location.