Not a gimmick, but I noticed that on some Fremantle shows, they now like to keep the contestants' or celebrities' mics open during the credits. I haven't figured out if it's annoying or just distracting, but I'm not a big fan.
It seems too much like an "intentional" technical "error", esp. since the conversation is mostly inaudible small talk about whatever bonus round. It's a change that doesn't add anything to the show IMO.