On the 1st DVD, go to the episode selection menu, and highlight the episode "Total Recarl" and go right (flower), hit enter and you'll get a short clip of how the sound effects for the lawnmower scene is created.
On the page for episodes 5-9, select episode 5 and go right (will highlight a sock), hit enter and you will see a alternate opening credit scene using live action people act out the three main characters. After that clip is a short live action/animation combination clip showing the real characters with different voices.
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Aqua Teen Hunger Force: Vol. 3 by Robert Spuhler.