The video for "Work Hard, Play Harder" is a tribute to her previous videos.  If you watch the scenes flashing on the barn behind her, you'll see scenes from many of them - Redneck Woman, California Girls, Politically Uncorrect, Come to Bed, Here for the Party, and many others that I'm probably forgetting.  It was like looking through a photo album, remembering the past.  All while bobbing my head to the rocking new tune.  Very cool!