edit: nvm, in this case he just added drums and sub bass. standard procedure.
The thing with Madlib and a lot of other prominent sample based beat makers is they have a funny way of imparting their unique style on things in very simple basic ways. There's nothing out of the ordinary really. It's mainly just a good ear. One thing I notice in today's beat culture is dudes try to hard to do to much. I've been really enjoying dillas king of beats album lately (the old dirty unreleased shit). Sample, drums, bassline. Nothing crazy, what makes it enjoyable is the precision of the chops, the drum rhythm and the bass bounce. 3 things all done extremely well. Cats these days think there's some "trick" or some "technique" they're missing when they hear good beat makers. They go out of their way to learn all these "teqniques" and end up making over produced messy beats with heaps of unnecessary sounds piled on top of one another, crazy effects and flabby bass lines. like a restaurant with a 4 page menu but no good food. Learn the basics... Learn how to chop samples properly, learn how to lay down drums with rhythm and tune, learn how to make bass lines. That's all you need... That's all madlib needs.