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.
Richie counts too. He was so popular with fans that he was promoted to a superhero in the third season; Dwayne McDuffie once said that Richie's popularity alone was what got them a fourth season of the show.
Fanon Discontinuity: Not a lot of fans were happy with the Superman crossover that continued the Darcy/Toyman storyline. Mainly because it made the former into a villain who was willing to take over a teenage girl's body when in the Superman series, she was more sympathetic and only wanted a life of her own.
Harsher in Hindsight: In one episode, Adam Evans insists on using fireworks for his concert despite the warnings from his crew about using them on a small stage. When the fireworks goes off, they end up setting the place on fire. This became a whole lot harsher when the Rhode Island nightclub "The Station" got set on fire in February 2003 during a Great White concert, and killed at least 100 people, due to a combination of polyurethane insulation and the band's use of pyrotechnics on a smaller then normal stage.
Hawkgirl hitting John Stewart's head in "A League of Their Own". Especially when you know what happens in "Starcrossed".
Static, in one episode early in the first season, does research on Replay from the "TV Trivia" website. Fast forward to today...
Also, at the time of that episode's airing, Neil Patrick Harris was a perfect choice for that role - a washed up child star who was only known for one role. Then, a few years later, How I Met Your Mother came along and shot him back into the spotlight.
In an episode where Static worked with Batman, he noticed Robin was absent and asked where he was. Bruce answered With the Titans. You might meet them someday. While the DCAU never made a Teen Titans cartoon, they were at least right that Static would join them in the comics several years later.
I Am Not Shazam: He's just "Static", not "Static Shock". It's gotten so bad, even the comics have made that mistake.
Minority Show Ghetto: While it was one of the highest rated cartoons on Kids' WB! when it aired, it could not secure enough merchandising deals to keep it alive (though it did run a respectable four seasons, a standard run for a lot of cartoon shows). It comes into this because the show's contemporaries (X-Men: Evolution, Batman Beyond) didn't suffer the same problems.
Narm: In the episode with the bullied kid who brings a gun to school, at one point the gun goes off. It's angled up in the air at the time, yet somehow Richie ends up getting shot in the leg. Richie's reaction to getting shot is something like "It hurts! It really hurts! It's not like on TV!"
In one episode, Virgil's sister, Sharon suspects that he is Static. The problem? She blurts out his identity at every given opportunity in public'' while cheering him on from the sidelines. Admittedly, people were running and screaming, trying to get away from the destruction of the fight, so they may not have noticed. Still a stupid thing to do, though.
In a Very Special Episode about gun violence, when Jimmy decided to lower his gun, his bullies decided to tackle him on the ground, setting the gun off, and hitting Richie. Another Face Palm worthy moment is when Jimmy pulled a gun earlier, they asked what it is.