ENTERTAINMENT
September 14, 2003 | Robert Abele, Special to The Times
When the inevitable "Twin Peaks" and "X-Files" comparisons start, Dan Knauf will be ready. His Depression-era television show "Carnivale," about traveling carnies, debuting tonight on HBO, ambitiously stirs a pot of altered realities, figures sinister and righteous, supernatural powers and societal outcasts, then covers it all with a patina of carefully cultivated weirdness.