In "Catch the Tail by the Tiger," Gobo, worried about his Uncle Matt's safety because he hasn't received a postcard for almost two weeks, declares he's going to Outer Space to rescue him. Nobody stops to think that Uncle Matt could be anywhere in Outer Space and that Gobo wouldn't know where to look. If Gobo had gone to Outer Space and gotten lost, the other Fraggles would be in the same position, worrying about him, someone else might have gone to look for him, and so on...
In "Marooned," Red and Boober are trapped in a cave-in and running out of air. They both quickly recognize the symptoms of this. Suddenly, living underground doesn't seem quite so charming and carefree...
Here's another one, reprinted from the Muppet Wiki: "Wembley has such a bad bonkleberry allergy that the smell of bonkleberries makes him bonk, and touching one will cause him to lose consciousness. It is unknown what would happen if he ate one."
In "Wembley and the Mean Genie," when Gobo and Red consult the Encyclopedia Fragglia's entry on the Genie, it lists "stealing, lying, and breaking things" as his good deeds, with his bad deeds undisclosed and nothing to hint at what they were aside from Gobo and Red's shocked reactions. With mundane wrongdoings being considered the nicest things the Genie has done in comparison, it raises unsettling thoughts on what actionswould qualify as the Genie's "bad deeds".
In "Invasion of the Toe Ticklers," Mokey befriends a caterpillar-like creature she names Agnes and calls a Toe Tickler. Overhearing the Gorgs' plan to poison Agnes so that the white flowers she would eat will be left undisturbed, Mokey takes her down to the Rock. Not long after, the other Toe Ticklers follow, so the Gorgs don't get to spray a single one. The white flowers grow into stinky yellowish ones that began crowding out the radishes and can't be pulled up. Luckily, the Toe Ticklers turn into creatures called Purple Sproingers, which fly to the garden and eat the stinkweed flowers. But what if the Gorgs had managed to spray the Toe Ticklers? Having the flowers start crowding out the radishes was bad enough, but what if the other Toe Ticklers had stuck around and the Gorgs, in spraying them, had gotten poison on the radishes, and into the ground they were growing in? What would have happened to the Fraggles when they ate the radishes... or the Doozer constructions? Remember that the Doozers mine the radishes and turn them into dust to make Doozer sticks. Plus, the Gorgs need radishes to make their anti-vanishing cream. What if the poisoned cream had caused them to vanish... as in, die?
The intro features more than one Mokey. The second verse of the theme song (the "doozer verse") features the Doozers singing and working while Mokey sits in the background watching them. Then the core five pops up to finish the verse. Mokey is, of course one of them, while another Mokey is still visible in the background. Technicalities aside (more than one muppet), how did she manage to be two places at once?
Several songs feature the Fraggles singing about things they wouldn't have heard of. One particularly glaring example would be "Catch the Tail by the Tiger", which features the line "A bird in need is a friend indeed" in its chorus. One season later, the Fraggles encounter a bird - which they immediately refer to as a "tree creature". (Then again, underground birds wouldn't live in trees.)
: "Wembley has such a bad bonkleberry allergy that the smell of bonkleberries makes him bonk, and touching one will cause him to lose consciousness. It is unknown what would happen if he ate one."