Liz shifts uncomfortably in her seat for several reasons.  The looks from the 'man' and beast alike are making her feel exposed, and the wooden benches aren't too nice on her rear.  But the biggest issue is how sitting down has made her belly pooch out even more than before.  She keeps having to fight with her dress to keep it from being too revealing.  She was looking down and trying to fix this when the creature roars, causing her to nearly fall off her seat in surprise.  Trying to laugh along with everyone else, she hopes her anxiety about this whole show isn't too obvious.