the anchorman commentary is a victim of this in certain parts. having lou rawls there for no reason was gold, but they tried to do too much schtick in certain parts. it worked with david koechner, but christina applegate doesn't have the improv skills to pull it off. also, the first 20 minutes of them doing nothing but cursing for the sake of cursing since it was an 'uncensored' commentary was lame.

2. only have people in the commentary who are important parts of the flick (writer, director, actors, producer), or are very knowledgable on the movie who can interject when people aren't talking (example: vincent pereira, the view askew "historian"). don't have the fucking boom mic operator there talking about shit nobody cares about.

3. make sure there's enough mics for everybody. it sucks when you can hear the main person and almost everybody else is barely audible.