Depends on the job.
Agents wear dark suits. Period.
If you're going to a major studio, you should probably wear a dark suit.
If you're interviewing at a network, couldn't go wrong with a dark suit.
You've got to remember, most of these entertainment companies are part of multinational conglomerates where the big kids wear suits. When I interviewed (for a senior position that didn't even require me to wear a suit), I wore a charcoal suit with faint pinstripes. Hugo Boss. One of the most non-descript, basic suits I own. I knew an interview was not the time for a tan RLPL suit or an aggressively styled Attolini suit.
For an interview? Dark. Simple.