I'll call you on this one. I had to look up Penn & Teller. Shocking I know. Who would have thought famous magicians could turn into foul mouthed wanna be debunkers. Sitting through 30 mins of Penn was grueling.
Here is an excerpt taken from wikipedia:
Penn & Teller "Bullshit"
Allegations (and acknowledgement) of bias
Many critics accuse Penn and Teller of being biased in their approach to debunking their opponents' arguments. For example, Chaz Miller, who was interviewed for the "Recycling" episode, said that Bullshit! attempts to exclude certain information if it does not favor the show's position. Some of these claims do not go without rebuttal: the Recycling episode does mention information on beneficial recycling though, specifically that recycling aluminum cans and other metals is in fact beneficial.
While Penn and Teller are self-professed skeptics, critics have been quick to note that Bullshit! is not dedicated to fact-based debunking or inquiry. An otherwise favorable review by The Onion A.V. Club noted:
Bullshit! isn't journalism, exactly. The show is one-sided by design: P&T's field interviewers rarely confront their subjects with the evidence against them, preferring to let the crackpots ramble on so that Jillette's voiceover rejoinders can score points without inciting a real argument.
Recycling
The myth-busting website De-Fact-o.com has criticized Penn & Teller's source on paper recycling (Daniel K. Benjamin, "Eight Great Myths of Recycling"), saying that Benjamin relied on outdated studies to make some of his claims.[16]