The stadium, the film scores, the fireworks!
Apparently the Republicans mocked the neoclassical backdrop. As if it isn't something they use all the time too, and as if it's not all over not only DC but every state capitol in the country. The real reason they're commenting on it is they're scared--they've been out-spectacled! This whole convention was very well constructed, with everything tying together, and working towards a real goal.
I can't imagine how the Republicans top this. I can't see how they even come close. They're gonna have one or two crappy singers, and Tom Selleck, and Arnold Schwarzenegger and he doesn't even count anymore.