These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Growing the Beard: Literally in his case; although he was popular in the The Sixties as a conventional, sharp-dressed comic, he became a star after he grew out his hair and beard and rhymed about it.
Harsher in Hindsight: A lot harsher, his '99 show "You Are All Diseased" opens with a rant on how pointless airport security is, including comments that you could easily sneak weapons on board and he doesn't appreciate having his bags searched for bombs.
"And don't give me this shit 'well the terrorists know their bags are gonna be searched so now they're leaving their bombs at home'. There are no bombs, the whole thing is fucking pointless!"
Not to mention where he talks about the weapons carry on rules, saying that they'll take them away from you, then issue you a knife with your meal. The way he punctuates it with mentioning that it might be plastic but he bet he could do some damage? Box cutters might be sharper than a plastic knife, but the size makes it only good for close quarters threatening...just like you'd really have to do with a plastic knife.
In Doin' It Again, Carlin remarks he doesn't care about drinking tap water, because he's an American and he doesn't mind drinking carcinogens...
After his second heart attack, Carlin said this:
"In the Celebrity comedian heart attack sweepstakes, I now lead Richard Pryor two to one. But Richard leads me one to nothing in blowing yourself up.
"Actually what happened was Richard had a heart attack, so I said, 'I'll have a heart attack.' Then Richard blew himself up, and I said, 'Fuck that. I'm having another heart attack.'"
George mentioned in one of his books, "You know what we haven't had in a while? A really big fire in a crowded nightclub. What's going on?" Unfortunately, in early 2003, Great White had a rather ill-fated concert in Rhode Island...
Hell Is That Noise: On the When Will Jesus Bring the Porkchops audiobook, George briefly screams to demonstrate his "moment of screaming" (contrast moment of silence) suggestion. And it is absolutely terrifying.
Hilarious in Hindsight: The opening rant of It's Bad For Ya is funny enough as a diatribe against media-prescribed role models...
I'd like to begin by saying fuck Lance Armstrong. Fuck him and his balls and his bicycles and his steroids and his yellow shirts and the dumb empty expression on his face. I'm tired of that asshole. And while you're at it, fuck Tiger Woods too! That's another jackoff I can do without.
...but would get even funnier in the coming years, when Woods' infidelity took its toll out on his public image and career, and Armstrong's steroid use ended his career in ruin and damaged the image of professional cycling as a sport.
Jerkass Woobie: The man's onstage persona was a total asshole towards the end, but he made so many people laugh anyway that he got a very mournful reaction from his fans when he died. After his death, his daughter mentioned that he was far less abrasive in real life then he was on stage, and while all the opinions he expressed on stage were his own and genuine, he was far less of a Jerkass about them off-stage. As he himself said, he didn't have a problem with individuals; it was people he couldn't stand.
Britt Allcroft, the producer of Thomas the Tank Engine, actually recalled after his death that Carlin was nervous reading his scripts without an audience. So they got him a teddy bear that sat in front of him in the recording booth for all 100+ episodes. She maintained that Carlin was actually a pretty gentle guy in person.