- Creative Differences: Why Demmel and McClain left. By the end, it was basically Robb Flynn's solo project with a backing band, and Flynn's increasingly autocratic nature culminated in Catharsis, which the two absolutely hated to the point of actively regretting having their names on it, and Demmel in particular wasn't even talking to Flynn by the final year or so unless he absolutely needed to.
- Distanced from Current Events: The music video "Crashing Around You" featured falling buildings, which would have been fine had the video not been released shortly after the September 11, 2001 terrorist attacks (the video was conceived and shot months before the attacks). The video was banned by MTV, which caused Roadrunner Records to drop Machine Head from their label. The band later rejoined the label after every label but Roadrunner rejected their album Through the Ashes of Empires.
- Fan Community Nicknames: Machine Head calls their fans "Head Cases."
Trivia / Machine Head