Arc Number: 5. Five seasons, Channel 5 news, everything's run by a company called "Cinco"...
Award Bait Song: Both Little Dancing Man and Little Danson Man feature examples.
Baby-Doll Baby: Played with for the commercial for the Cinco Boy. A mother loses her child and is told about a life-size replica that gets replacement models at it grows older. Deconstructed as the mother looks rather disappointed in the obviously fake replacement later in the episode when the spokesperson checks in on her. He's still pleased with the results.
Beauty Inversion: Taken up a notch: in addition to making well-known celebrities uglier (like John C. Reilly as Dr. Steve Brule), they also take their average-to-below-average-looking cast and do the same.
Bittersweet Ending: Brothers Cinco. Terry is sent to jail for the murder of his wife, and it turns out the only reason Mark made him use the E-Trial software was just so he could take over the company. Worse, Mark learned Terry was guilty because Terry and his wife planned the death just so Terry could take over. However, once they admit what they've done, they begin exchanging ideas for new inventions and make up.
Despair Event Horizon: Subverted in the commercial for Cinco's H'amb, where a man driven to suicide after losing all of his money finds hope again thanks to the titular H'amb, substitube lamb made from ham. And then Double Subverted after hearing the horrible Pun for substitute lobster made from ham, Ham'bster.
Drone of Dread: Often, during awkward silences to up the uncomfortable factor.
Jan and Wayne's marriage slowly falls apart as the series goes along due to Jan's implied affair with Steve Brule.
Steve himself is an extremely awkward manchild.
Casey is obviously a parody of severely mentally challenged kids who have amazing talents.
Tim and Eric themselves. Tim is starved for attention and even his own parents favor Eric over him, and Tim pushes Eric down the stairs in the 50 anniversary reunion episode. By the Chrimbus Special, it's apparent that Tim's hate for his partner and self-esteem issues are festering and festering hard.
Distant Finale: They did this one prematurely, with a fake 50th anniversary episode.
Eye Scream: In "Crows", Tim and Eric get their eyes pecked out by crows.
Flanderization: Casey seems to grow more sickly and physically repulsive as the series progresses, compare his first appearance, where he's somewhat composed and only devolves into sputtering and gagging when the song begins to skip, and one of his later appearances, where he's visibly sweating and rash ridden and far more prone to aggressive outbursts of sneezing, violent gagging, and occasionally vomiting.
In Name Only: Afternoon Review: The Daytime Show For Women and Morning Meditations, which open with the promise of a feminine talk show, then quickly cuts to men doing strange activities before cutting back to the title.
Invisibility: "Missing" features invisible dog-possum creatures called rascals.
Live-Action Adaptation: The episode "Pepperoni" was to feature a live version of Tom Goes To The Mayor, but Tim and Eric weren't satisfied with the results. The opening is still in the episode (with Tim making a cameo as Tom near the end), but the full sketch is part of the Season 2 deleted scenes.
Punny Name: Many of the names of the people from the commercials have ridiculous and quite possibly offensive names like Bradley Michael Fahrtz for the Poop Tube, Dick Dousche and his eponymous Cleaning Rag, and Diha Riah-Jones for D-Pants (which, in itself, it a Punny Name).
Primal Scene: Implied in Channel 5 Kid Break song I Wear My Dad's Dirty Socks.
Retraux: The whole show, but The Uncle Muscles Hour especially.
Satire: A good majority of the effects, commercials, and character satirize corporate advertising (such as any number of the Cinco products) and bad pop culture (the episodes "Comedy" and "Jim and Derrick").
Parody: Brules Rules parodies advice columns, Quall of Duty parodies cop shows, Crows and horror films (with Homage to Birdemic).
Pastiche: "Pusswhip Banggang" with late 70s rock, both Back To Squall and Road Trip and 80s comedies
Snap Back: Tim has died at least five times. In "Resurrection", David Liebe Hart even comments about how death is not a big deal for Tim. However, things don't always snap back at the end of an episode. Casey remained dead until being reanimated by his brother, but Steve Mahanahan, who died in the same explosion, came back to life with no explanation.
Thanatos Gambit: In the narrative episode Brothers Cinco, Terry Cinco and his wife Lynn planned to help him take over the Cinco company by staging her death and then feeding on his brother Mark's sympathy until he gained total control. As a result, Mark goes out of his way to care for his brother, even going as far as developing a foolproof court software, E-Trial, to prove his innocence... until we learn he overheard Terry and Lynn's plans, and it turns out the only reason he made E-Trial was so hecould take over the company.
Too Much Information: Many, many skits derive their humor from this, particularly anytime when Will Grello (played by Will Forte) reveals disturbed events from his childhood.
Toilet Humor: A pair of pants that allow the wearer to avoid the bother of using the toilet. Another sketch had an invention that allowed the male user to poop using a urinal while standing the entire time. Yet another product was an adapter to use a urinal to take a shower.
Tim and Eric have stated their intention to have every season opener feature a diarrhea related Cinco product.
What Could Have Been: "Gettin' It Dunn", a spinoff that would have starred Richard Dunn instead of John C. Reilly. The idea was discussed for a while and in 2009 one episode was filmed, but since then Richard has passed away so unfortunately there's no chance of a full series.
You Mean Xmas: Chrimbus, the "lifetime season of the year" and "the season of getting." You decorate everything in yellow and blue, eat a pound of your hair, and if you keep Chrimbus bush trimmed and wet, Winterman (a large naked man wearing only a vest who lives in a cave) will stuff your Chrimbus bush with your favorite present.