* The RunningGag with Tom constantly mispronouncing "aeronaut" as "aeronort", despite Becky's attempts at correcting him. He STILL hasn't learned how to say it properly by the climax of the film, when the characters give themselves cool titles while chasing the comet down.
* The movie's versions of Cain and Abel. There aren't any sibling murders, but Cain is a leather-dressed biker and Abel is a literal Boy Scout.
** FridgeBrilliance comes into play when you remember that Adam was never a child himself, the only other human he's met is Eve, and he has no idea what these little whiny things Eve keeps finding are, or from where she found them. At one point, Adam embarks on a journey to discover just where Cain came from, leaving Eve, who is heavily-pregnant again, behind. When he returns from his fruitless journey none the wiser, Adam is flabbergasted to discover that Eve has "somehow" managed to find ANOTHER child.
-->'''Adam:''' (''exhausted'') I never saw such luck! (''passes out'')
** If you pay attention during this scene, you'll see that Adam's cart has ''square'' wheels. No wonder he was so tired!
** During Cain's infancy, Adam thought that he was some sort of fish, but was mystified that he could laugh when Eve played with him. His attempt at replicating this with an ''actual'' fish is witnessed by both Eve and Cain. The fact that even as a baby, Cain looks wide-eyed, like even ''he'' can tell how ridiculous his father is acting, makes it even funnier.
** When Adam ''finally'' grasps that Cain isn't a fish, he instead thinks that he's an enigma or "some sort of bug". As he's trying to feed him a worm, Cain throws a glob of baby food at his father's face.
-->'''Adam''': (''through gritted teeth'') Perhaps I can take it apart and see what its arrangements are...
** As Cain grew, Adam then operated under the assumption that he was some sort of small bear during the majority of his childhood. When he and his brother mature into the appearances detailed above, Adam reflects about how "Abel is a good boy, but if Cain had stayed a bear, it would have improved him."
*** This bit might also be an instance of ShownTheirWork, as in Christian symbology, [[BearsAreBadNews the bear is the animal that's most commonly associated with Cain]].
* While he was in Eden, one of Adam's favorite pastimes was surfing down a huge waterfall, When Eve discovered this, she desperately tried to keep him from hurting himself, but [[ComicallyMissingThePoint Adam refused to stop because he didn't see any other use for the waterfall]].
* When God first creates Adam, he's asleep, prompting God to wake his creation up.
-->'''God:''' Adam...\\
'''Adam:''' (''mumbles sleepily'')\\
'''God:''' ''Adam!''\\
'''Adam:''' (''mumbles some more'')\\
'''God:''' '''ADAM!!''' (''His giant live-action hand pokes Adam awake'')\\
'''Adam:''' ''What?!''\\
'''God:''' It's... for you. (''meaning the Garden and all of creation'')\\
'''Adam:''' (''picks up a banana and holds it like a phone'') Hello?
* Eve's insistence in naming everything in the Garden, which she does by nailing signs to everything, including Adam. When Adam tries to do the same, he accidentally nails his sign to an elephant's head, which tosses him into the trees for his troubles.
* To catch up with Halley's Comet, Mark Twain has the kids dump as much unnecessary weight from the airship as possible. When Huck pushes out the type setter, Twain calls it the "worst damn investment [he] ever made".
* The movie's version of "Captain Stormfield's Visit to Heaven", where Stormfield, following Halley's Comet to Heaven, accidentally winds up in the ''wrong'' Heaven, one intended for a race of aliens with slug-like bodies and three heads. He finds that it's basically a loud, hedonistic nightclub where everyone is drinking, smoking, dancing, and making out; WAY too intense for a simple Christian man of the early 20th century. When Stormfield finally finds his way to Earth's Christian Heaven, much to his relief, he discovers that it's not necessarily so great, either.
-->'''Stormfield:''' (''after being given his wings, his halo, and a book of hymns'') Show me a cloud! I'm all right now!\\
'''Angels:''' SHHHH!!\\
'''Stormfield:''' ...I think.\\
'''Angels:''' SHHH!!\\
'''Mark Twain:''' A harp, a hymnbook, and wings?! Good God, what a swindle!
* Near the end of the film, before he merges with his dark half and Halley's Comet, Twain dispenses some wisdom to the children, while said dark half acts as the peanut gallery:
-->'''Mark Twain:''' Always obey your parents.\\
'''Dark!Twain:''' ...''when'' they are present.\\
'''Mark Twain:''' Be respectful of your superiors.\\
'''Dark!Twain:''' ...''if'' you have any.\\
'''Mark Twain:''' Rise early, for it is the early bird that catches the worm.\\
'''Dark!Twain:''' I once knew a man who tried it. Got up at sunrise, horse bit him.
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