It depends on Minion's recording setup. If he's using something on the level of a PC headset, then it's probably not going to get much better and I'll see what I can do with it.
Only comment I have on the audio clips at this point is that I still think Lou Bega's a little on the loud side, but get somebody else's opinion on that before you change anything. I might be biased, due to the fact that it's my line he's stepping on.
I really don't know what else to say about the BGM selections until I see what you had in mind for the visuals to go along with them.