Remember that spoilers are not hidden in Fridge and Headscratchers.
Fridge Brilliance
- Billie and Thea are cousins. Their mothers are sisters, which makes them cousins and Bill and Ted their genuine uncles and not the type of uncle that is a real close friend of the family.
- Bill and Ted are also technically step-brothers, as they both had the same step-mother, though not at the same time.
- Brilliance in brick jokes, Evil Bill in the second film predicted that Missy would eventually marry one of her former sons. Surprisingly enough, it turns out he was right: She married Deacon, Ted's younger brother.
- Mr. Logan's SWAT van appears in hell, because it "died" along with him.
- The real fridge brilliance is that if robots like Dennis go there, so might vehicles.
- The robot the people in the future send back to kill Bill and Ted is really bad at his job, killing a ton of people that are not Bill and Ted during the course of the movie. However this makes sense as the people that designed him have lived a peaceful existence for generations and would have no use for a killer robot, let alone know how to design an effective one.
- Not only that, but while the Great Leader seems committed to the idea of making martyrs out of Bill and Ted, the idea might not be very popular for the people she assigned to build and program the thing. This could also explain the Inventional Wisdom behind giving it a sense of empathy; this was their way of trying to sabotage the mission by making their killing machine really bad at killing.
- The circumstances under which Bill and Ted finally wrote the song that unified the world; they didn't write the song themselves, but just as they brought together an eclectic group of individuals to pass their history report and defeat their evil robot doubles in the previous films, here they were the catalyst for their daughters to bring together history's greatest musicians and compose the song themselves.
- It seems strange that the "song that unites the world" doesn't have any lyrics about love, peace, or anything else about what unites humanity. It doesn't have any lyrics at all...which is the point! If the song had any words to it, they would have to be translated hundreds of times over—once for every language spoken—in order to "reach" everyone in the world, or else they would have to be in a single language that leaves a lot of people out of the loop. A simple instrumental is much more inclusive, and has the potential to unite literally everyone without changing anything about it.
- The third film explains why Wyld Stallyns' music is so well-liked in the future. It's not just the fact that they're "great for dancing", but the fact that Bill & Ted both were trying to write the song to unify the world. So, that means, every album consists of songs about unifying everything, being peaceful and loving, the kind of message the future seems to adhere to. And they did it with every single album and song they produced.
- Due to Dennis being able to end up in Hell, and being a robot himself, that means that the Evil Bill and Evil Ted from the second film are more than likely in Hell and somewhere off screen.
- On the other hand, perhaps machines only end up there if fully vaporized so they have no corporeal existence. Otherwise, considering the number of possible robots in time and space, the demons would likely have encountered one before Dennis.
- Payphone-based time machines become outdated in the future in direct accordance to payphones themselves being outdated exactly 600 years prior (possibly as a consequence of the apparent San Dimas Time that operates in the future world).
- It makes sense that the start of the film has them not being the world-changing band that they were told they'd become. Many artists, be it music, film, literature or art, were often considered not good at the time of their works were made. Most famous artists are often considered great long after their careers are over, sometimes after their deaths. A great example is Vincent Van Gogh. When he was alive and painting, he couldn't sell any of his work because people thought he was a terrible painter. Only after his death did his artistic vision begin to be respected and influential.
