WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Coat Hook Retaining Screw
Courtesy of GENERAL MOTORS CORP.
Remove the screw that secures the coat hook to the headliner. Remove the coat hook.