I miss some of those great DVD extras.

In the movie, Robert Downey Jr's said he didn't break character until he finished do the DVD commentary. He was in character when he did the DVD commentary.

There was a special edition of Buckaroo Banzai with an onscreen commentary that pointed out that Buckaroo was carrying Einstein's brain with him when he entered dimension 8

edit = the movie was 'Tropic Thunder.'