Yeah looks like the plastic (Or is it rubber?) piece broke. Happens to me once every few years. The trick with the mat is to pull the foot area forward first and then slide the entire mat to the left. like I said its harder to get the damn mat out then to put the pedal back into place.

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1982 300GD Carmine Red (DB3535) Cabriolet Parting Out
1990 300SEL Smoke Silver (Parting out)
1991 350SDL Blackberry Metallic (481)

"The thing is Bob, its not that I'm lazy...its that I just don't care."