While telling them, Hiram even suggestively wiggles his finger, and Dan quickly moves his hand away from the zoetrope.
In "The Barber", Dan inadvertently causes a pair of scissors to pierce a man through the chest.
In "Art", Elise seemed to have enjoyed that nude picture of Chris a little too much.
Then there's this:
Chris: Notice how the piece follows you around the room?
Also from episode "Art", Dan says that vandalism is "the worst kind of 'ism' there is...unless you count fascism...and I guess racism is also pretty bad". Granted, he makes it clear fascism and racism are bad, but it's still unusual for a PG-13 show to even acknowledge those things exist.
The censors probably didn't even watch the episode. When Chris says he doesn't want to help Dan with his revenge that day and just wants to "make it a Chris day", Dan replies "Naked Chris Day? Gross! Put some clothes on and come help me."
And there's the vagrant pointing out to Dan that Mr. Mumbles should be Miss Mumbles by shoving her groin in the latter's face, as well as his nervous change of subject when asked the context in which that discovery was made.
In "Dan", Chris, under the conviction that his best fried has created an alternate personality as an outlet for altruism, calls Elise to inform her that he has 'snapped', to which she responds "Wait, how has Dan snapped? Clock tower?"
Yet another firearm-correlating excerpt is Imposter!Dan threatening to shoot our three heroes in 'self-defense' should they not leave what has become his squatter's hole.
From "Gigundo-Mart", after Dan catches Chris shopping at a supermarket that Dan hates, Dan outright accuses Chris of sleeping with the enemy.
Dan says "damned" in "Ye Olde Shakespeare Dinner Theatre". True, he was speaking in the Shakespearean sense, but it was still unexpected for TV-PG.
For most of the series Elise says "Oh my gosh!" as an exclamation, but in "The Dinosaur" she actually screams "Oh my God!" when Dan tells her Chris is dead. Chris ALMOST interrupts it, but it's still audible enough to tell she's saying God.
In "The Mall Santa", Dan shows his resume:
6/19/04-6/19-04 — RIBLETS — CHICKEN GUY — My breasts are bigger than theirs.
8/3/01-9/11/01 — PARTIED LIKE IT WAS STILL 1999 UNTIL SEVERAL ANGRY PEOPLE TOLD ME TO TURN ON THE TV.
In "Gigundo-Mart", when Dan gets put into a chokehold by a greeter
Greeter: I learned this move on the beaches of Normandy!
In "Monster Under the Bed", Chris tries to comfort Dan by telling him it could be worse — he could have been harassed by 'Ugragoth of the ...Deviant Art'. Note that this is the episode about the tentacle monster.