Space Ghost. Two of his appearances have him getting eaten by a bear and then stumbling drunkenly into a network executive meeting looking for work. He's seen lying under a table at The Stinger of the third episode.
Cats Are Mean - Cat Man. Also, Coiffio is described as "The Evil Controller of Cats."
Cat Girl - Inverted. Its a Cat Man in this series.
Cat Man's real nature is played with. He obviously looks like a guy wearing a cat suit, but he denies it whenever it's brought up around him.
Characterization Marches On: In the first episode, Model Robot sounds like a stereotypical robot, while in later episodes he suddenly sounds a lot more laid back and has a tendency of adding 'baby' to the end of his sentences.
Coiffio, meanwhile, is fairly neutral towards Model Robot in the first episode, whereas afterwards he suddenly gets a lot more hostile, calling him "Model Asshole" and eventually ordering him to self-destruct.
Downer Ending: Gerald seems to go insane with trying to get Brenda from Young Man. After Sherman eats the Hamburger Necklace that could have possibly worked somehow, he resorts to assassinating him. The result isn't shown, but at some point after that, Coiffio's box army comes back into play and overruns the Tunaminium. In short, Young Man loses his life, Brenda loses her fiance, and Gerald loses his mind and doesn't get his perfect hair.
Fan Disservice: Young Man somehow making his face appear on a nude photo of Brenda, and speaking through it. It's not that she was drawn looking like that either — she looks normal on the scroll before the camera zooms in. The effect is... mildly unsettling, to say the least.
Fanservice - Brenda is the anthropomorphic personification of typical anime fanservice directed at young men, which is fitting considering the show's status as an Affectionate Parody.
The ending song for the first episode contains the line "Do that thing to that guy. Play that trick on him." The seventh episode ends with Gerald mentioning how they played that trick on that guy.
The second episode has Gerald saying "...my physical appearance will one day resemble that of the other handsome students." The sixth episode reveals that the other students are all palette swaps of him, with better hair.
For the Evulz - Supposedly the reason why Brenda started the Cat-Bun Wars.
According to episode 8, she did this to save Gerald...somehow.
Model Robot. Considering the wacky and loose nature of the show, however, it is entirely possible that he could have been brought back in later episodes had it not been canceled. He seems to be alive and well in the finale, but this is unexplained.
Young Man appears to be killed by Gerald in episode 8. It's left ambiguous as to whether he really died or not.
Mistaken Identity - Two at once. Astronomic Cat brings Coiffio the severed hand of Young Man, which Coiffio assumes belongs to Gerald. Coiffio then calls Uncle Grandfather to brag about killing his son, only Gerald is his nephew. Or maybe just his student. It's a mind*EFF*.
Murder the Hypotenuse: Gerald shoots Young Man in the last episode, as a last-resort plan to try to get Brenda to fall for him.
Young Man comes second-closest to being this when he's not providing needless exposition.
Catman comes way closer. As early as the second episode, he develops a complete disdain for "all you anime people and your stupid journeys", and does his best to abstain from actively participating in the plot, preferring instead to...hang out at his house, and work at a convenience store. Like a sane person.
The Pirates Who Don't Do Anything: Nearly everyone in the show. Coiffio wants to stop Gerald from getting to Tuna Mountian for unknown reasons, but all he really does is stand around on his ship waiting for someone to buy his old house. Uncle Grandfather at first seems to be The Obi-Wan, but just sits around getting Brenda to bend over or making vacuum cleaners to EFF cakes. What Brenda herself is supposed to be doing in the first place is never made clear, she spends most of her time following Uncle Grandfather's commands, many of which are just excuses for him to peep at her. Young Man... well, we're not sure what he's supposed to be doing, but he mostly just hangs around with a bunch of argumentative animals while telling then that they don't understand. The only person who's actually doing anything is Gerald, who is trying to get to Tuna Mountain.
Prematurely Bald - Gerald is a teenager with a combover. Just look at the page image.
Punch Clock Villain - Catman works at a convenience store when he is not doing Coiffio's evil bidding. Or rather, when he is not blatantly ignoring Coiffio's evil bidding. Or rather, while he is blatantly ignoring Coiffio's evil bidding.
The Quiet One: Brenda almost never talks. She does once — in Japanese, when initiating the Cat-Bun Wars.
The last few episodes were released on the Internet.
Even in the seventh (and originally final) episode, the resolution isn't shown, Gerald just walks toward Tuna Mountain, then it cuts to some other scenes, then Gerald is coming back from Tuna Mountain, with perfect hair. He even mentions a bunch of cool adventures they went on that the audience doesn't get to see.
Retcon: Gerald had apparantly gone to Tuna Mountain in the seventh episode, complete with having hair, yet in the eighth, Uncle Grandfather blows it up before he could reach it and builds Tunaminium in its place.
The sixth episode is a motorcycle race. It's handwaved with "You're going to Tuna Mountain? Gonna need motorcycles. Motorcycles. Tuna Mountain."
The fifth episode is a parody of sketch/variety shows, and network tv as a whole.
Unexplained Recovery: All the time. Coiffio is somehow still alive after being shot in the gut, and Young Man's hand seems to be capable of growing back, among others. Oddly, Gerald's ear stays severed
Verbal Tic - Action Hotdog's "Do the la la la la la...."