A lingering criticism of Denis Leary is that he stole some of his early material (mainly smoking/cancer related material) from Hicks.
Completely Missing the Point: Pretty much every time that Garth Ennis quoted or referenced Bill Hicks in the pages of Preacher, as Ennis was fond of using Hicks' material to mock people Ennis didn't like, all the while ignoring the fact that Custer and Cassidy were the type of people Hicks routinely mocked in his stand-up.
Crosses the Line Twice: Most of his act, but none more so than when he brings out lolicon-loving, sex maniacal, Anti Christ wannabe 'Goatboy', or 'Beelzebozo, The Clown from Hell.'
The Rush Limbaugh routine doesn't so much cross the line twice, as perpetually accelerate back and forth over the line in a giant circle. Refuge in Vulgarity doesn't even begin to cover the first line.
Jokes in 1988 about coming back around 1994 with a smoking-related illness, a tracheotomy and a voicebox: "Y'all were right, smoking's bad!"
To those concerned with such things, Hicks died in February of 1994 of pancreatic cancer that, by the time it was discovered, had already metastasized to his liver. Smokers are more prone to various pancreatic cancers.
Hicks' rants about the first Persian Gulf War applied equally well to the second, right down to the name of the president. (Although the "tell me when, Lord" portion may be more a Funny Aneurysm Moment in the light of actual reports of W crediting his war motives to divine inspiration...)
His bit on George Michael, back before he came out. One line in particular went, "If money had a dick, George Michael would be a flaming faggot." Well...
He used the last few weeks of his life before he succumbed to cancer to reread The Lord of the Rings.
One of the tracks on Arizona Bay is titled "Clam Lappers and Sonic the Hedgehog", where he enthusiastically declares that if interactive porn were to exist, he'd have high scores at "Clam Lappers".
"And that was one weekend. That was Easter weekend, man!"
Misaimed Fandom: Garth Ennis famously tried to shoehorn numerous references to Hicks in his comic series Preacher (Comic Book), even though a good amount of the series (most notably the anti-religious themes) directly contradict Hicks' own views on religion (Hicks believed in the existence of God and the usage of psychodelic substances to achieve closeness to God, whereas Ennis and Preacher were violently anti-religion and ended with the main character having God assassinated by a rogue angel).