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* '''Miriam's alcoholism.''' Even WordOfGod says that she's an alcoholic, but the Nickelodeon censors told Craig Bartlett and the writers that they couldn't outright say it, so what do they do? Have her as a depressed, narcoleptic smoothie addict (never mind that some alcoholic drinks do exist as smoothies -- piņa coladas, hurricanes, daiquiris, etc). Also if you pay close attention you'll notice that one of her ingredients for a smoothie is Tabasco sauce. There are even hints that she was busted for at least one DUI. One episode has Arnold ask Helga "when did she [Miriam] get her license back?" and another has Bob casually remark that she's supposed to start community service that morning.
** There are a few episodes where, if you listen closely, you can hear ice cubes rattling inside Miriam's usual cup of coffee.
* In "[[BeachEpisode Summer Love]]", Grandma stumbles across a private nude beach, which she then says "When in Rome..." and takes off her bathing suit. All the beach goers run away screaming. On top of that, the nude beach is called, "Mature Wood Private Beach"
--> '''Phil:''' Awww, Pookie, [[FanDisservice no one wants to see THAT]]!
** In that same episode, both Suzie Kokoshka and Miriam are invited by a typical RomanticFalseLead to a ''stimulating'' dancing class. After hearing the "stimulating" part, they both giggle. And for the final blow, the class is only shown off screen, with the women saying "Ooh, you are so wonderful dancing!"
** When Miriam told Bob about learning "the Watoosie" from a man named Carlos, he was obviously uncomfortable with it. Then again, since he was sun-burnt all over his body, he might have wanted someone to take care of him.
* In the episode "New Teacher" when Mr. Simmons is trying to teach the class about poetry, Harold stands up and recites, "There once was a man from Nantucket..." Mr. Simmons tells him to sit down before he can get to the next line.
** Which is, as everyone knows, "Who kept all his cash in a bucket." Interrupting it allows you to infer he was going to recite the ''other'' version instead, making it naughtier than it actually is.
* Arnie's hat in "Weird Cousin," anyone? [[SomethingElseAlsoRises Twirling clearly equals unfortunate erection]].
* "Arnold Visits Arnie" gives us Lulu, the BizarroUniverse version of Lila, who keeps trying to seduce Arnold (later it turns out [[spoiler:that it's AllJustADream]]). At one point she propositions him for a private TwoPersonPoolParty at night. She also stands behind him while he reaches for a high shelf in a store, and... tickles his tummy. Innocent, yes, but what else can you imagine a girl possibly reaching for when she's standing in that position behind a guy? Arnold even hangs a lampshade on it when she tries to give him a kiss:
-->'''Arnold:''' But you're Arnie's girlfriend! ... and we're nine!
* At the end of "Synchronized Swimming," Jack proposes that he and Tish "[[{{Malaproper}} implore the mysteries of the deep]]" and they both dive underwater (and conveniently out of the camera's view). [[TwoPersonPoolParty The implications are obvious]].
** And let us not forget Coach Wittenburg saying "circumcised swimming".
** Pretty much every episode featuring Wittenburg and Tish ends with the implication that they're about to have make-up sex.
* After Helga's confession in {{The Movie}}, and a passionate kiss, Arnold states he's dizzy, and needs to go lie down. Helga's response: "Wonderful...I'll go with you!"
** In the beginning of the movie, it is suggested that they throw a block party to raise awareness and stop the neighborhood from being taken over by Future Tech Industries. When coming up with a name, [[TokenMinority Gerald's]] suggestions are "Block Power" and "It's a Block Thing".
** Big Bob calls out the villain for "shafting" him in their deal. Depending on who's hearing, this can be inappropiate or not.
* In "Grandpa's Birthday", he wakes up and believes that he's in heaven. When he sees Oskar however, he panics and says "This must be that other place!"
** In the Latin-Spanish version he actually says "I must be in Hell!"
** Also alluded to in "Haunted Train" when Grandpa is tilling the titular urban legend, using "fiery underworld" in place of hell. In that same episode, Gerald sings a song about the train with a verse describing how the engineer "drove it straight to..." but he finishes with "Hey!" instead of hell.
* We get this little gem from "Back to School":
-->'''Arnold:''' You're not too old, Grandpa, and you've still got plenty of brain cells.\\
'''Grandpa:''' No, not since Woodstock.
** For anyone who doesn't know, "Woodstock" was a 1969 music festival with more drugs than music.
* Curly's StalkerWithACrush interest in Rhonda is anything but subtle. He's constantly suggestively telling her to "Give Daddy some sugar..."
* "Grandpa's Packard" features this exchange.
--> '''Ivana [=DeVansovich=]''': Wonderful. I simply love your car. It's so well-preserved.
--> '''Grandpa''': That's not the only thing well-preserved around here, lady. *eyebrows move up and down*
* In "Buses, Bikes, and Subways," Arnold's class sings an uncensored "99 Bottles of ''Beer'' on the Wall" in unison on the bus with Mr. Simmons happily conducting. Not very shocking, but compare to other cartoons, which would replace "beer" with something else.
* In the episode "The Racing Mule" Oskar yells "Go Glueboy, get movin' you big crazy ass!" They [[BleepDammit tried to]] [[SoundEffectBleep cover up the word "ass" with a horn]], but it is still audible to those who have good ears.
** Actually, since he is presumably referring to a donkey in the above scene, that wouldn't actually be swearing. A donkey is an ass. However, some American TV shows (particularly kids' shows) will censor a curse word that has (or had) a legitimate meaning (like "dam" if it's used as a pun for "damn" or "hell" if it refers to the actual pit of despair for those who were evil in life).
** Similarly, in the episode "On the Lam," Harold, Stinky, and Sid pull a school prank with a bottle of Jack Ass Kicking Louisiana Hot Sauce.
* Helga mentions that she performs "Tantric spells" towards the end of "Helga on the Couch". It's a pretty clever one too. For those who don't know, Tantra is a subset of Hindu spiritualism revolving around the carnal (read: sexual) aspects of human physiology, and it has rituals (often misidentified as "spells") nominally used for inducing lust in a person (it's where the expression "tantric sex" comes from). In short, Helga is using Hindu spiritualism to seduce Arnold.
* In "Helga's Parrot", Helga recited one of her obsessive love poems in the presence of a parrot, who then flew off and almost repeated it to Arnold. One part of the poem was: "Arnold, you make my girlhood tremble, my senses all go wacky." (This one is probably the most well-known adult joke of the series.)
** Here's another one from that same poem. At the beginning of the poem, Helga calls Arnold "My sultry preteen". For reference, the adjective "sultry" can mean two things: something very hot and humid, or something attractive in a way that suggests or causes feelings of sexual desire.
*** In other words, this particular poem pretty much had Helga flat-out state that Arnold made her horny. No wonder she was especially ferocious when going after the parrot.
** In the same episode, she ends up watching Arnold undress and then coos and passes out with a very happy face. Were the censors asleep when approving this episode!?
* Similarly, in "Helga Sleepwalks," it's established that Helga's sleepwalking spells are tied to her subconscious desire to tell Arnold her secret. With that in mind, one of her sleepwalking spells has her end up ''showering in Arnold's shower'', forcing one to wonder exactly where her subconscious was going with that.
** After seeing how many dirty jokes involving Helga are present in this page, you have to wonder if Helga's true intentions with Arnold are entirely innocent... (Made more inappropiate by the fact they're both nine.)
* In "The Old Building", Ernie teaches a certain "exercise" to Arnold involving reaching and pulling. And he says this:
--> '''Ernie''': Do that every day, and when the big moment comes, you'll be ready.
** This is made even more inappropiate when you remember the fact Arnold's nine. Most kids don't discover masturbation until they're about 12, when they're (usually) just starting puberty.
* In "Ghost Bride," Arnold reads this tombstone aloud with the rest covered in grass: "'Here lies Cynthia Snell. She lived her life and went straight to'...[[CurseCutShort I can't read the rest.]]"
** In the very same episode, it shows the backstory of "The Ghost Bride" as graphically as the censorship would allow them which included her brandishing an ax towards the couple's home, the shadow of the ax coming down on them with psycho strings playing, she sitting next to the murdered corpses humming the wedding march and then jumping out the window.
* During "The Journal", Arnold found his father's journal which his Grandpa Phil begins to read aloud to the family. When he gets to his father's account of his wedding night Phil starts to read the words "It was the hottest night the jungle had" and the flashback showing us Arnold's parents in a hut seductively looking at each other... as Phil uncomfortably trails off from reading and distracts Arnold with thoughts of ordering dinner. As soon as Arnold leaves the room Phil rips out the page and hides it.
** FreezeFrameBonus, you can read the rest of what it says on that page.
-->''It was the hottest night the jungle had ever known, and I'm not talking about centigrade. Stella was unbelievably beautiful, wearing nothing but a smile. Trembling, I took a step towards-''
* Speaking of Grandpa's war stories: There was that (made-up) flashback in the "Veterans Day" episode with UsefulNotes/AdolfHitler in it. His name is even said a few times.
-->'''Arnold:''' You did not fight Adolf Hitler, you're making this all up.
-->'''Grandpa:''' *laughs* Okay you got me, I made that part up. Pretty funny huh *laughs* It was [[http://en.wikipedia.org/wiki/Joseph_Goebbels Goebbels.]]
** The word "Nazi" is said a few times as well. However, [[NoSwastikas not everything got past the radar.]]
** Part of Grandpa's story involves him staying the night at a farmhouse, with three beautiful french women. The oldest one, Monique, visits him in the night in a [[VaporWear figure flattering diaphanous dress]], to tell Phil that the war has made her feel scared and lonely...Gerald's father then urges him to skip over this part of the story, since it was clearly headed in an erotic direction. Looking at Arnold and Gerald's reactions to the interjection, it seems like they wanted to hear it. When Phil resumes the story, he recalls that he woke up the next morning "[[DidYouJustHaveSex feeling like a million bucks]]."
* In the episode "Helga's Love Potion," Helga says "What is this crap?" while reading one of her poems after the spell to get rid of her obsession with Arnold gets cast on her.
** Helga, Harold, Mr. Potts, Dino Spumoni, and others said "crap" and variations of the word so many times that it is unlikely that the word was on the radar at all. Helga also says "freakin'" in the episode "Helga's Locket".
** Torvald says "sucks" in "Tutoring Torvald", which eventually got caught by the censors and was re-dubbed with "stinks" in the 2000s ("sucks" still appeared on the closed captioning). The reruns on The '90s Are All That and the official DVD release of season one keep the original line.
* In the Swedish dub, Helga has gotten away with saying "What the hell" and "Damn".
* "Fishing Trip" starts with the guys singing [[https://en.wikipedia.org/wiki/Miss_Susie "Miss Susie"]] in the car and in the end Davy Jones sings the whole song.
* The sole fact that Oskar's last name, "Kokoshka", means "shit" in Russian. [[SincerityMode How fitting.]]
* In "Gerald vs. Jamie O", Gerald deals with a girl called Chloe. When Arnold introduces him and Gerald, the latter holds a corn dog and it's [[SomethingElseAlsoRises pointed upwards with a "boing" sound as he stands up.]]
* The truck driver at the end of "Abner Come Home" is seen smoking a lit cigar, despite Nickelodeon's strict no tobacco policy.
* In "Dino Checks Out" during the news cast looking back on Dino's life, we see a picture of him with The Creator/RatPack. They are clearly in a bar holding alcoholic beverages.
* "Big Bob's Crisis": During Bob's NDE, you can briefly see his asscrack out of the back of his robe.
* In "Wheezin' Ed" Gerald mentions the titular character of the episode lived during prohibition, the time in the US when alcohol was illegal.
* "Timberly Loves Arnold" has Lila suggest she and Arnold be a threesome with Timberly. The context of the story makes it innocent, but Lila's suggestion with Arnold's flustered expression makes the scene sound a lot dirtier.
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