What kind of yellow is used for a typical minifigure?
I believe it is supposed to be 24 Bright Yellow, however I know there were some complaints a last year or so regarding the collectable Minifigures and others that were made in China not having the same hue as "regular" minifigures - and now that some of the licensed products are also being made there, this difference will become more common.

These figures are apparently not made from ABS but a cheaper plastic, which is what causes the difference in colour.