Yup, it's a great movie, but I haven't seen it in years.
Of all the DJs that I have seen live, I think Mixmaster Mike was the BEST! It was an amazing show at the Lizard Lounge in Dallas. The Beastie Boys played one of the large venues in Dallas, then Mixmaster Mike played his aftershow from like midnight to just about the break of dawn! IIRC, I think that was his Bangzilla tour.
His skill is amazing, and he definitely sees what gets the response out the crowd and uses that to mix in the next track. For the first hour or so, he would drop in like 1 line from the Beastie Boys, then pull it off and say "y'all aint ready for that yet".
Mixmaster Mike is pretty heavily featured in Scratch.