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.
"Benson's gonna drop his BALLS when he sees how good we set up these chairs. He's gonna be all like, 'Oh no, my gumballs.'".
Bowdlerization: In the UK, the line is changed to "Benson's gonna drop his gumballs when he sees how good we set up these chairs," and the second part is cut. Interestingly enough, Benson being called a "greasy slop jockey" by a bratty birthday kid and the part where Muscle Man and High-Five Ghost retrieve the clown and horse for the party (with heavy implications that the clown is hungover) wasn't cut in the UK and the American version doesn't cut the "Benson's gonna drop his balls..." line.
In "Skips Strikes":
Benson: Who would of thought that a mandatory team building activity would get us to the championship?
Mordecai: Thanks to my power hook!
Rigby: No way! Thanks to my atomic fireball!
Benson: And because of my *chuckles* backup balls!
"Carmenita's special parts should only be manipulated by a professional."
Alternative Character Interpretation: In "House Rules" Mordecai learns that Rigby may die young or just leave Mordecai. Have episodes like "Think Positive", "Best Burgers in the World" and "Replaced" made him more lazy in order to hang out more with Rigby?
Arc Fatigue: The development of Mordecai and Margaret's relationship has been agonizingly slow. After four seasons of Mordecai making minimal effort to take their relationship beyond friendship, Margaret finally gives him a kiss when he sees her off at the airport. So they're finally together, right? Nope, next episode involving them says that Mordecai is still considered to be in the "friend zone". At the end, they share a mutual kiss, and the next episode has Margaret introducing him to the rest of her family. But "Steak Me Amadeus"'s plot revolves around Mordecai asking Maragret to be his girlfriend. Given everything that had happened prior, it was pretty easy to think that she already was.
Margaret is either a funny, well written supporting character or an annoying, bland plot device for Mordecai.
Thomas, the new employee is either an okay addition to the cast or he's The Generic Guy with no mention whatsoever how he got the job or why the park needs an intern (though in "Exit 9B," it is implied that he is there for college credit).
CJ- is she becoming a Margaret Expy? Should she and Mordecai stay just friends or start going out? Would it feel forced if they did go out?
Big Lipped Alligator Moment: Averted. Weird stuff does go down on the show, but, unlike most Big Lipped Alligator Moments, the weirdness is part of the plot.
Crazy Awesome: The first two-thirds of most every episode is pretty straightforward and nothing unusual for most TV shows, but when you come to the last third, you'll have a hard time picking up your jaw.
Margaret herself was this for Mordecai/Rigby in the early seasons.
Dude, Not Funny!: Muscle Man laughing as Rigby's choking in "See You There". While the show's usually absurd enough in its use of death as a punchline, that particular moment was a little too serious.
How many fans reacted to the ending of "The Best Burger In The World" where the food truck falls in a ditch and Mordecai and Rigby lose out on getting their burgers (more specifically: Benson ate them purposely.)
Rigby's entire behavior towards Mordecai in the episode "Do Me a Solid".
"Wall Buddy" only adds fuel to the fire.
Pops repeatedly making himself horribly sick in "Guy's Night" by chugging down literally gallons of milk in a few hours to try to beat the "Milk Challenge." Whether it was meant to be funny or not is debatable, seeing as how everyone in the episode is genuinely horrified by this, and people actually do die from consuming excess fluids in so little time.
What most people consider of the ending to "Do or Diaper", where at the exact moment Margaret is about to kiss Mordecai she deliberately misses so that way he will lose the bet and have to wear a diaper for a whole week.
Quips' jokes from the episode with his name. Some of his jokes are so genuinely lame unfunny jokes that he is actually funny. However others, especially those directed at people, seem so unsympathetically cruel that they cross from being Innocently Insensitive to being just plain insensitive. Pops and the Guardian of Youth insulted by Quips could attest to this.
The baby ducks became quite popular over the course of their two appearances.
Eileen has automatically became a very popular character after "Do Me a Solid" due to her Adorkable personality and her crush on Rigby.
Family-Unfriendly Aesop: The episode "Think Positive" gives us "sometimes yelling at people is the best way to solve your problems".
Genius Bonus: The Dudetime Cologne attracts unicorns. In medieval times, it was believed that a virgin's purity would attract unicorns. Therefore, guys who use Dudetime are virgins (and so is Mordecai).
Growing the Beard: First season's episodes are pretty formulaic: Rigby and Mordecai plot a Zany Scheme, it backfires horribly, nothing is achieved, they end in deep S, bonus points for Skips saving the day and/or Benson getting pissed off at the very end. Second season's episodes usually make it so the positive outcome is roughly equal to or outweighs negative, but we don't know the way in which both come, making plots much less predictable. Also, the show's pretense of being a "kids' show" is hanging by a thread moreso now than it did when it started.
Harsher in Hindsight: The "Viral Video" episode which has a Warden trying to police the web. SOPA almost did that in 2012 (thank goodness it was vetoed).
They're doing it again with CISPA, and unfortunately, that actually passed — until the Senate put its foot down and decided NOT to vote for it at all after stalling.
Oddly enough, Rigby! The horrible revelation in 'House Rules' has made Mordecai quietly but desperately protective of him.
Pops. Oh goodness, sweet dainty Pops.
Moral Event Horizon: What Night Owl did in his debut simply so he can be famous forever was harsh.
Klorgbane crossed it he destroyed Skips' high school prom, knocked out the principal, and got Mona killed in the crossfire just so he could fight Skips.
Most Annoying Sound: Depending on the episode, Pops's high-pitched, grating crying. Sometimes it's just painful to listen to. Other times, like in "Prankless," where he's nearly killed by Muscle Man's prank and has to be taken away in an ambulance, it's actually reallyheartbreaking.
Relationship Writing Fumble: The 'will they or won't they' attitude of the Mordecai/Margaret ship. In "Picking Up Margaret," it was leaning towards, "They will," but "Steak Me Amadeus" established that Margaret will never be Mordecai's girlfriend because she got accepted into her dream school.
"Video Game Wizard" features a knockoff of Rush's "Subdivisions" on the car-ride to the tournament.
"Steak Me Amadeus" has one for Lynyrd Skynyrd's "Tuesday's Gone" after Mordecai gets dumped.
One of Depeche Mode's "Just Can't Get Enough" plays over a montage in "Skips' Story".
Take That, Scrappy!: Muscle Man's failed attempt at standup in "Under The Hood": he makes a 'my mom' joke. No one in the crowd laughs and some even get hostile towards him, to the point where he has to leave the stage. This is exactly the reaction a lot of viewers have to him and his jokes.
Also "Rage Against the TV" in which he gets knocked out by The Hammer.
Benson gets another one from Mother Duck who points out Mordecai and Rigby saved the park AND the world despite the damage. That Benson yelling at babies is just plain wrong. AND that he was the person who ordered Mordecai and Rigby to stop the Geese in the first place.
Tastes Like Diabetes: Don asking for hugs, amplified by the fact that he asks by saying "Give me some sugar!"note Though possibly it's more he's kept a childlike view of showing affection, as "sugar" is the slang some very young children use for hugs and kisses. Note the use in the flashbacks. He even starts by hugging Benson and Pops who are made of sugar.
Also note, we're not entirely sure how old Don is. Rigby is 23 and he's the older brother, Don apparently just grew rapidly and everyone thinks he's older than he really is, which Rigby actually says. So it makes since he's more childlike than Rigby.
The pink fairy creatures in "Sleep Fighter." In fact, after seeing them on TV for many hours straight, Muscle Man went nuts and even saw them in his nightmares.
They Wasted a Perfectly Good Plot: "Bad Kiss" pretty much wastes the chance for Margaret and Mordecai's relationship to finally go further than friendship, thanks to Mordecai chickening out on kissing her. He actually DOES get a kiss from her in "Picking Up Margaret.
Guitar of Rock on so many levels. The episode could have focused on Mordecai and Rigby's relationship with Benson, but instead chose to focus more on the weird fantasy elements. Also, Benson was a drummer. If he had mentioned that to the bouncer, then they'd have gotten that guitar easily.
What Do You Mean, It's for Kids?: More sex jokes, frequent lethal use of weapons and mild profanities ("crap", "sucks", even "pissed") then you can shake a yardstick at. Justified, as Regular Show is based on two short films J.G. Quintel made in animation school called "2 in the AM-PM" and "The Naive Man from Lolliland." While "The Naive Man from Lolliland" is safe for family viewing (the one use of the word "hell" wouldn't faze most viewers), "2 in the AM-PM" isn't — at least by Cartoon Network's already selective standards.
The Woobie: Thomas who debuted in the episode "Exit 9B" is most likely one of these. He was in the right place at the wrong time and witnessed all the parks employees (except Mordecai and Rigby) get brainwashed and was forced into being the lackey of the main villain of the episode. The villain was also downright verbally abusive to the poor goat.
Mordecai has his moments, most often in Margaret episodes.
Pops, any time he's sad. It's like the equivalent of watching someone take candy from a baby- and the fact that he cries so easily just makes you want to hug him!