So awesome that it spawned a television show. Supposedly the only reason the show exists is because the creator improvised the theme song at some Williams Street party as a joke. They really liked it.
Also the musical interlude in Blackwatch Plaid.
Ensemble Darkhorse: Phil Ken Sebben and Reducto. Both voiced by Stephen Colbert. The Bear, as well.
Hilarious in Hindsight: In Guitar Control, which aired around election season 2004, Phil runs for President of the United States. His voice actor, Stephen Colbert, would go on to do the same by the time the next election rolled around.
In "X Gets the Crest", Zardo is seen looking at X's ass twice. He also tends to drape his arms (arm and mace?) around X a lot in this episode. In fact, the whole episode might as well be called "X and Zardo share ho yay moments for roughly fifteen minutes".
Zardo is also caught staring at Harvey's rear end in the same episode.
X's obsession with Harvey borders on this on occasion.
In the episode "Juror In Court", Peter Potamus' copy of Kama Sutra for Dum-Dums shows Quick Draw Mc Graw and Baba Louie in the "cowgirl" position.
Reducto's obsession with the Inch High Detective is ultimately revealed to be this. ("I hate him!" Slap. "I love him." Slap. "I hate him AND love him!")
Harvey and Boo-Boo the Bear are often seen waking up together.
Peter Potamus has been caught under Phil's desk, with is head between Phil's legs, at least once.
Heck, basically all of the male characters are hinted to be bisexual at some point or another. Of course, with the show's style of humor, it's up for debate how much of this is just comical misunderstandings and how much is exactly what it looks like...
Scapegoat Creator: Stephen Colbert; after retooling the show to focus on his characters and their exploits, the show fell apart when he bailed upon it and was quickly cancelled. He also holds the blame for the failure of the Harvey Birdman video game, which used the popular Phoenix Wright game engine. Most reviews of the game pretty much focused exclusively on his refusal to voice his characters and the piss poor replacement voices Capcom had to scramble to get to replace him, in attacking the game
Parodied in an episode when Harvey points out how many cartoons followed the mold of Scooby-Doo, complete with barely altered characters.
Squick: Phil Ken Sebben lusting after Birdgirl. He is repeatedly told the truth but doesn't believe it. Near the end of the episode where he and Birdgirl are to be married he looks out over the crowd and decides "...there... might... have... been... someone... else... (he)... was... meant... to... be... with". Birdgirl's aunt Phyllis, Phil's sister!
Not to mention how Aunt Phyllis looks just like Phil with a blonde wig and very large boobs in a dress. Yes, the eyepatch and mustache too.
When he finally does understand who Birdgirl is (in the last episode) he is utterly disgusted and disappointed in her for trying to get in to his pants. Especially since he's helpless, with the one eye. ...in his pants.
The Scrappy: Referenced with regard to the Trope Namer. When Scrappy dies, everyone laughs. Especially his "Uncle Scooby."