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.
YMMV: The Late Late Show
Acceptable Targets: Canadians (the wacky next-door neighbor), the French (they enjoy fornicating and judging you), the Germans (they like pooping on each other), and West Hollywood.
Craig had Wilford Brimley on the show only because he thought he'd seen the retired actor getting salad at his local grocery store. Brimley openly stated in the interview that even he didn't know why he was there, since he didn't have anything to promote.
Billy Connolly proved to be the first guest on the show to actually know how to play a harmonica (which every guest gets an opportunity to play at the end of their segment). Of course, Craig was prepared for such a day, awarding Billy with a golden mouth organ for his efforts.
Dude, Not Funny!: Entertainment media took note when Craig said during his monologue that he would not joke about Britney Spears, citing his own struggles with alcohol and drugs. He made a similar statement recently about Charlie Sheen. At first, some saw the Britney stance as a ratings ploy, but with the Sheen statement he may be legitimately trying not to go after some obvious Acceptable Targets.
Ear Worm: "...Okay? Hey, hey! Tomorrow's just your future yesterday..."
Secretariat's leitmotif. It's probably just production library music, but it sure can get stuck in your head.
Many of the Check The Tweets intros can apply here.
Genius Bonus: Not many late-night talk shows throw in jokes about Søren Kierkegaard or Gustave Flaubert. Even fewer do so while maintaining a full quota of poop and fart jokes. And probably none except Craig can do both within the same joke.
Craig: I know what you're thinking. You're thinking "Craig, wasn't Nietzsche the father of Existentialism?" Well, he might be. Others say the father of Existentialism was [Jean-Paul] Sartre, perhaps even [Arthur] Schopenhauer. There's only one way to find out — all three of them should go on The Maury Povich Show and take the paternity test.
September 2, 2011: Craig and Geoff manage to build a running gag out of the phrase "careful, Icarus."
Growing the Beard: Geoff Peterson became much funnier and more interactive with Craig after Josh Robert Thompson began voicing him live in lieu of Geoff's original batch of canned responses. More specifically, the segment where Geoff started the "I've got a place there" running gag and made Craig totally lose it marked the point where Geoff really began to shine.