Critical Research Failure: One episode mentioned that it's true that storing batteries in a refrigerator increases their longevity.note It's partly true if you live in the tropics, but other than that you're more likely to damage the batteries instead.
The fake ad for water sold in bottles as a sports drink. At the time, it was funny to imagine that anyone would do that. Now it's hilarious that they actually do — and it's a massive cash cow.
In the episode about gravity, Bill stands outside a movie theater that is ostensibly playing a film called "Gravity" (and there's silent film parody of people being affected by it). Come 2013...
The running gag in the "Dinosaurs" episode where they show old movie footage of dinosaurs and humans interacting to remind people that that NEVER happened with dinosaurs that aren't birds becomes this when you look at how Bill has been contesting Creationism in his later career (as Creationists claim the exact opposite).
One Season 4 episode is a countdown of his Top 11 best music videos.
Just Here for Godzilla: Many fans have been attracted by its theme song, its humor, its many over-the-top parody commercials and its filk music videos.