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.
Canon Discontinuity: The only Oh Yeah! short not to be shown on the show proper, "Chalk Rain". Also notable because it featured a fact about Chalkzone that never was mentioned again: the rain in Chalkzone is the chalk sidewalk drawing being washed away... by the rain.
Despite this, a clip of it still appears in the intro.
Ear Worm: The theme song, by far. To a lesser extent, the Accordion Worm song.
The 1-minute music video songs run a close second.
Skrawl's song. After two or three variations of it, it will never leave your head.
Buttercup, one of Elizabeth Daily's most popular roles, has an episode where she destroyed the chalk of her sister, Bubbles. This becomes ironic in ChalkZone, where Rudy Tabootie, who is also voiced by Daily, pretty much has chalk as his main weapon.
The show got a soundtrack in February 2003 entitled In The Zone, and was released under Jive Records (which Nickelodeon was releasing its' soundtracks under at the time). Jive would release another album of the same name later that year in November.
Various GIFs of Rudy drawing the portal with the text "Fuck this shit, I'm going to ChalkZone" have appeared often on Tumblr.
As are "why friendzone when you can ChalkZone?" jokes.
Misblamed: Fans of Invader Zim complained that this show replaced their favorite show. While in reality, ChalkZone was delayed for two years. Not to mention that Zim was still running during the first season of the show.
It's also been misblamed for being a rip-off of the 1970s British cartoon Simon in the Land of Chalk Drawings (which later aired on Nickelodeon in 1979 and throughout the '80s as part of Pinwheel). Co-creator Bill Burnett stated in a recent interview that ChalkZone was never meant to be a rip-off of the show- in fact, he had never even heard of it until after ChalkZone finished production.
Moe: The main trio. Actually, the entire show is moe.
Rudy's already a cute kid, but he's even cuter as an eight-year-old in the first two Oh Yeah! Cartoons shorts.
Rudy's two-year-old cousin, Sophie, who appeared in "The Terrible 2 1/2s", "Pop Goes the Balloon", and "When Santas Collide".
Most Wonderful Sound: Rudy singing. While all three of the main trio's voice actresses can sing very well, E.G. Daily (Rudy) is the only one who made a career out of it. Doubles as The Cast Show Off.
Narm Charm: A lot of the music video segments could qualify. One example would have to be "Chunky", a rock song that features lyrics about...painting your room and going to the moon with chunky peanut butter. The lyrics in a lot of the songs are very goofy and cheesy, but the Ear Worm quality mixed with Rudy, Penny, and Snap's voice actresses all being really good singers make them enjoyable for a number of fans.
Screwed by the Network: Not only was the series premiere delayed for years, the last 6 episodes didn't air until 2008... a whole 3 years after the beginning of the final season. Even more, 2 additional episodes were planned but never aired at all.
The show originally aired at 8:30 PM on Friday nights (for new episodes- repeats would air throughout the entire week) during season one and got extremely high ratings (even being the seventh highest-rated animated show for the 6-11 demographic and the fourth highest rated Nicktoon in 2002). Despite that, it took over a year for season two to air (to the point where some viewers had begun to think Nick canceled it after six episodes), and Nickelodeon moved the timeslot to 9:30 PM. While this may have worked for Invader Zim, which was aimed at an older audience, ChalkZone was aimed at a younger audience than Zim, and 9:30 PM is usually around the time the target audience would be going to bed. It got worse when Nick gave up all the show's airtime to more popular fare like SpongeBob, The Fairly OddParents, and The Adventures of Jimmy Neutron: Boy Genius, leaving it with only its' 9:30 PM timeslot on Fridays and one timeslot on both Saturday (two if you count the show on Nick on CBS) and Sunday.
Tear Jerker: For some, the song "Time to Go Home" due to being rife with End of Series Awareness (the episode it aired with was the last episode in production, however five episodes premiered after it)
They Wasted a Perfectly Good Character: Terri Bouffant after she became an antagonist in "Indecent Exposure", wanting to expose ChalkZone. Her only other appearance as an antagonist was in "Snap vs. Boorat". The show ended one episode later.
Vindicated by History: When it was still running, ChalkZone was despised by a lot of older Nickelodeon fans. These days, you will find much more fans than haters.
We're Still Relevant, Dammit: The show happened to be made about five years after everyone stopped using chalk for things like school boards, restaurants, and the many uses that seem to pop up in the show.
Due to hipster baristas, shop owners and street artists, Chalk seems to be making a comeback.