In general, or with regards to Markle?
There was the time he compared the war in Afghanistan to a video game.
The “Paki” comments:
https://www.theguardian.com/uk/2009/jan/12/prince-harry-racism
When he said he hated flying helicopters after they spent so much money training him and pretending he was fantastic at it.
The Newsweek interview where he said no royal wants to be King or Queen.
https://www.bbc.com/news/uk-40363063
When he said the royals were “the family she never had.”
I’m probably forgetting some. I’d say the stupidest (and most revealing, retrospect) was the one about hating the Apaches. They’d spent tons of money and pr on him and he destroyed it all in one second. They were honestly upset with him too, because the heli program was a concession to the fact that he insisted on going back to the front. It’s very telling, however, in restropect. I think he always felt that they were trying to make him into something he wasn’t.