It's typically staged that at one point, as Elder Price has the spotlight, a bunch of dark walls/curtains cover Elder Cunningham as he tries to peek out of the darkness.
Even better, according to the official book, that wasn't planned until Josh Gad got caught behind the closing wall during rehearsal unintentionally and they just had to keep it.
When Elders Price and Cunningham are waiting for their plane, an African sunset backdrop suddenly falls while a woman dressed in a Lion-King style costume leaps out and sings an Expy of the opening vocals to The Circle of Life. The curtain then drops to reveal it was just a surprise to send the boys off to Africa.
And then there's the climax of the song, where they start singing "Fuck you God in the ass, mouth and cunt-ah!" repeatedly, and then suddenly turn it into a African rhythmic chant with the women singing more rounds of Hasa Diga Eebowai on top of it.
From "All American Prophet", in the middle of the song...
Elder Price: Even though people wanted to see the golden plates, Joseph never showed em...
Doctor: (in a deep, operatic voice) I haveeeee maggots in my scrotummmm! [beat]
Elder McKinley: Imagine that your brain is made of tiny boxes, then find the box that's gay and CRUSH IT! Okay?
Another stand-out of 'Turn It Off'? In the stage performance, the part where they start clapping literally makes the lights go out, plunging the stage into total darkness for a couple of seconds. The second time this happens, when the light comes back up, they're all now wearing sparkly, hot pink vests on-top of their normal clothes. Elder Price looks totally confused for a second, before deciding to go along with it.
After General BFN shoots one of the villagers and Elders Price and Cunningham run into the Mission hut (with Price covered in blood), Elder McKinley tells them that the mission president is asking for a progress report (which is a problem, as there is no progress to report). Elder Price gets the idea to talk to the president and ask for a transfer, grabbing Elder McKinley's face in his excitement. McKinley's reaction must be seen.◊
The SMHD costumes alone are hysterical, from Halloween-style devil outfits with plastic pitchforks to maple doughnut hats to demons wearing giant coffee cups (who torture Kevin by force-feeding him coffee) to sparkly black top hats and waistcoats.
Elder McKinley, again, after waking Elder Price from the Spooky Mormon Hell Dream:
Elder McKinley: You had the Mormon Hell Dream? Was I in it?!
"I Believe" is a funny enough song as is. The fact that Elder Price is practically prancing up to a maniacal warlord and grabbing his hand, however, makes it priceless - the only reason that the General's men aren't shooting him is because they're too confused by what's going on.
General: ... The fuck is this?
"I believe... that in 1978 God changed his mind about black people!" (followed by the choir echoing "black people!").
Elder Price, after having the Book of Mormon shoved up his ass, gets completely wasted... on coffee.
Which becomes a bit of Fridge Brilliance, when you realize that Elder Price is purposely trying to avoid sleeping at all costs, hence the coffee.
Elder Price: Well, if it isn't Elder Cunningham! The super-mormon!
This is followed up by his monologue on why he became such a devout Mormon. He hoped that when he died, he'd get his own PLANET ORLANDO!
"I am Africa" is hilarious, but one line particularly stands out.
Doctor: Something incredible... you've done something incredible! I've never seen a rectal blockage of this kind!
From "Baptize Me": I'M WET WITH SALVAAATIOOON!!!
It's hard to describe "Joseph Smith American Moses", but... "Joseph Smith, magical AIDS frog! Brigham Young, frog on his clit face!"
"Compassion! Courtesy! Let's be really fucking polite to everyone!"
Also, the summation at the end of the song: "Joseph Smith, AIDS frog; Brigham Young, clit face; Shit come out the butt; Jesus says 'fuck, fuck,' Mormoooooons!"
The entire song is a Crowning Moment of Funny , but "Hi, my name is Joseph Smith. And I'm going to fuck this baby." and "Brigham Young! His nose was a clitoris! What will you do, Joseph? Will you fight the clitoris man?"