//It seems the "marriage" was the chat that brides and grooms get before their wedding, explaining procedure, going through the service etc//
Probably similar to the chat the Duchess says she didn’t have when she wasn’t briefed on the effect marrying into the Royal Family would have on her and the responsibilities she would be expected to endure. As The Queen said, "recollections may vary."
//One wonders why this was not touched upon in the Oprah fest.//
Lots of things were not touched upon during the Oprah fest. That was because nothing was allowed to interfere with the message.