The ever-resourceful folks over at GameFront compiled a fairly comprehensive video on a bunch of the jokes and references found in Volition's latest Saints Row title. Which is quite good, by the way.
There are a lot. This is just a good, chunky scratch off the top of that iceberg.
There's an arguable spoiler near the end of the video at around 4 minutes in, so just be wary of the few seconds following that.