Some photos here, confirmed players who played at least some part:https://www.gettyimages.in/search/2/image?family=editorial&phrase=Aston%20villa%20hibernian%201989David Platt, Paul McGrath, Nigel Callaghan, Chris Price, plus Gareth Evans, John Collins and Gordon Hunter for them.
I think Nielsen came on as sub and scored the winner. He seemed to have enjoyed himself in the pre-season, as I remember someone behind me commenting "fuck me, we've signed the fat Jan Molby" when he came on.
Yes, see the first newspaper screenshot above: "Old hands take a step back".
I took the afternoon off for the Rags game, sat up in the Trinity and the only thing I can recall was the PA playing up and emitting a crackle every now and again that sounded like we were under fire from snipers.