Herman's head (1991)
0 revealing mistakes in show generally - chronological order
Starring: Hank Azaria, Yeardley Smith, William Ragsdale, Jane Sibbett
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Revealing mistake: When the holder of the nude seminar's handing papers to Louise, you can see that behind the lectern she's wearing underwear. (00:14:00)
Louise Fitzer: Do I sound anything like Lisa from The Simpsons?