I've been to a few audience recordings in my time...off the top of my head (mainly gameshows!)
Who Wants To Be A Millionaire - Both with Chris Tarrant and Jeremy Clarkson - they don't usually play the background music you hear on the TV in the studio but do for Millionaire just to make the contestants even more nervous than they already are!
Deal Or No Deal - Both with Noel Edmonds and Stephen Mulhern - the weird thing is you think 'what a load of rubbish!' with all the 'dream factory' nonsense they go on about watching at home but being in the studio as a 'pilgrim' you really do get into things and start to get 'feelings'! (also yes the banker is a real person on the other end, you will often notice watching on TV the audience jump when the phone rings as it is VERY loud!)
Million Pound Drop LIVE - Davina McCall - More security checks than Manchester Airport getting in the studio for that as the million quid was apparently real dosh and not just prop money
Countdown - Nick Hewer - Quick recording as they do film it pretty much as live since they have to record 5 shows in a single day! Audience got a pen and paper to join in, I was useless

(30 seconds is nothing especially with the clock ticking away in the background which again is VERY loud compared to the TV!)
The Cube - Phillip Schofield - They shoved me directly behind the friends and family so all I could see when I watched it back on TV was my clapping hands! Amazing how they edited that with all the fancy graphics and slow motion for TV, the contestants had to watch a generic example of the upcoming games on a tiny screen rather than 'The Body' and 'Voice of The Cube' Colin McFarlane and look up into thin air when Phil said 'you've won £x!' Also obviously they had to get a crew in to reset the game each time after a failure but you would be surprised how quick they were at doing so!
The Apprentice You're Fired - Tom Allen - Got to watch an episode of The Apprentice a few days early and hold up the famous 'Hired/Fired' card at the end!