Accidental Misnaming: In "The Zero Hero", when Darla finally goes on the date she won with her favorite TV superhero, Captain Muscles:
Captain Muscles: And so I saved the universe once again. I'm pretty terrific, eh, Delilah?
Darla:[no longer impressed] The name is Darla!
Alternative Foreign Theme Song: The French dub has one, sung by a chorus of children over a montage of clips from both the theatrical shorts and Hanna-Barbera's animated shorts.
Ambiguous Time Period/Anachronism Stew: The cartoon is supposedly set in the late 1930s, but it includes microcomputers and commercial television. "Pete's Big Break" features a black man who owns a TV station, and in "The Zero Hero", Spanky and Buckwheat mention push-button traffic controls. Wikipedia considers it a Setting Update.
Babysitting Episode: The animated short "Tiny Terror" has Butch leave his baby brother with the Rascals so he can run an errand for his mother. Among other things, the baby climbs a tree and bombards Alfalfa and Spanky with apples.
Complaining About Things You Haven't Paid For: In "Big Top Rascals" episode, Butch complain about the makeshift circus and ask for a refund. When Spanky says, "But we let you in for free," Butch suggests that everyone's money be refunded.
Cowboy Episode: "Showdown at the Rascal Corral" wasn't set in the Old West as such, but Alfalfa did play cowboy.
Everyone Loves Blondes: In "Beauty Queen for a Day", the boys compete for the affections of their new neighbor, Dolly Van Dumpling, all but forgetting about Darla.
Loophole Abuse: In "Science Fair and Foul", Buckwheat makes the other boys promise not to peek at his science fair project before the fair is held. But since Darla wasn't in on that promise, Spanky decides that they, Alfalfa and Porky can inspect Buckwheat's project on the sly.