!!For the animated series:
* HilariousInHindsight: One episode featured a ''Series/MisterRogersNeighborhood'' spoof called Mr. Radish. 30 years after that episode aired, a ''Mister Rogers'' spin-off called ''Series/DonkeyHodie'' premiered. In the show, the protagonist adores a superhero character called The Amazing Radish.
* SpiritualSuccessor: ''WebVideo/TheCinemaSnob'' said it was like a modern ''WesternAnimation/MrPeabodyAndSherman''.
* MemeticMutation: "What color ''is'' an orange?" "Ted, you bonehead! It's color is the same as its name. Just like a lemon!"[[labelnote:Explanation]]An exchange between Bill and Ted which became a meme after [[https://www.youtube.com/watch?v=CGLOzth4wCE a clip of it]] was uploaded to Website/YouTube.[[/labelnote]]
* TheyChangedItNowItSucks: Essentially what killed the series, the second season was major re-tool as a result of switching animation companies, voice actors and tone, whereas instead of going back in time, the duo travel through stories, TV shows and the human body. Granted there was nothing wrong with trying to vary it up, but the execution was lackluster and, along with the other changes, didn't appeal to the fans of the movies, causing the season to be CutShort and ultimately cancelled. Fox would replay the Hanna-Barbera series the following summer.
** It was particularly noticeable on its British broadcast on Creator/Channel4 with both seasons aired as one season of 21 episodes (all that were produced). [[BaitAndSwitch The first [=DiC=] episode to air had the Hanna-Barbera opening added on]]...
!!For the live-action series:
* ValuesDissonance: As pointed out by the Smeghead from WebVideo/CinematicExcrement in [[https://www.youtube.com/watch?v=sbVJ9JpAY_I his vlog about the series]], the episode ''It's a Totally Wonderful Life'' (about Rufus accidentally splitting up Bill & Ted and finding himself in an dystopian society) depicting Alt!Ted in the wrong for busting corrupt cops had already aged poorly by the time the episode aired, which was just a few months after the Los Angeles riots caused by the Rodney King trial, but nowadays? Where concerns over police brutality have severely increased? Yeah, it's damn near embarrassing how tone-deaf the episode is.
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