DR FJL - As for cabs in L.A...
There are always tons of cabs around Universal because of Universal City Walk (restaurants, bars, shopping, movie theaters, etc.), and the theme park (Universal Studios). And since you'll be at the hotel, the bellmen will be more than happy to call a cab for you if one - or two or three... - are not already waiting in the carport.
As for getting back from LACC or Genghis Cohen - or wherever you end up - if you're near a subway stop, there are usually cabs circling since the subway stops are near business centers and not residential areas. Additionally, just ask the cabbie for his card, and give him a call for your return trip. They like a "guaranteed" fare and tip.