The guitar solo before KISS' "God Gave Rock And Roll To You", is performed by guitar legend Steve Vai. The footage had already been shot, and the world premiere was a week away, when he was asked to do it. He also contributed various music in the film, including "The Reaper Rap", which features on the end credits.
When Bill and Ted go to Missy's séance, you can see Chris Matheson and Ed Solomon, the creators and writers of Bill and Ted. They're the only men that are attending the séance. (Chris is the guy with the white shirt, and Ed is the guy with the glasses.) They also say "ed and chris rule the world" backwards
The "Riddance of Evil" book that Missy uses to send Bill and Ted to Hell, is actually a re-dressed copy of the Stephen King short-story collection "Four Past Midnight." She opens it to a page in the story "Secret Window, Secret Garden," which can be read clearly in a few frames of the film.
In the scene where Bill and Ted are addressing God, there are two statues at the base of the staircase. One is of Michael Powell, and the other is of David Niven, an homage to Powell and Emeric Pressburger's afterlife classic Stairway to Heaven (1946). The stairway itself is the same as the one in that film, which has the U.S. title "Stairway to Heaven".
The evil robots arrive in the parking lot of the Circle-K convenience store, the same place where Bill and Ted first meet Rufus in Bill & Ted's Excellent Adventure (1989). That's why there's a second square burn from the phone booth.....
In a deleted sequence, the Evil Robot Usses use devices to re-create Bill's and Ted's' personal Hells (Granny Preston, the Easter Bunny, and Colonel Oats) and send them after the heroes. Bill and Ted end up having to face their fears to get rid of them. Bill gives Granny her kiss on the cheek, Ted calls his brother and apologizes for stealing his Easter candy, and both boys treat Oats with kindness and friendship rather than terror.
When Ted's father is taking de Nomolos away, Death says "Book em, Danno," made famous in Hawaii Five-O (1968). William Sadler would later go on to play the role of Jack McGarrett in Hawaii Five-0 (2010).
The Evil Robot Usses were supposed to kill Bill and Ted at the Battle of the Bands, whereupon the boys would invoke their wins against Death to get resurrected. This part does appear in the comic book adaptation of the movie, which was based on an earlier draft of the script.
When Ted attempts to get into Heaven by proving himself worthy, he says, "Every rose has its thorn. Every night has a dawn. Every cowboy sings a sad sad song." These are the key lyrics of "Every Rose Has Its Thorn", a song sung by Poison.
In the beginning of the movie, when Wild Stallyns is auditioning for Battle of the Bands, and when Ted is introducing the princesses, he says "...the beautiful princesses from medieval England...", and turns away from the mike at the word "medieval", trying not to expose their time traveling. However, the sentence segment that came just before that was "celebrating their fifth year in the twentieth century". Also, in the birthday party scene, the cake says "Happy 521st Birthday".
In 2010, Keanu Reeves and Alex Winter said that a script for Bill and Ted 3 was in the works and that they liked the story which takes place 20 years after this film. However, George Carlin passed away in 2008.
The film came in at No. 2 at the American Box Office, which it was beaten by Terminator 2: Judgment Day (1991). Incidentally, the film itself mocks The Terminator (1984). In the film The evil robot duplicates of Bill and Ted are sent back through time by De Nomolos to stop the real Bill and Ted from winning The Battle of the Bands and when the evil Bill and Ted robots time travel in the stolen time machine, they wear sunglasses.
The ceiling of the future classroom was a left over set piece from the film "Mom and Dad save the universe". Solomon and Matheson also wrote that movie, the set was saved from demolition when bill and ted was the next film shot in that studio.
The scene, in which Evil Robot Bill and Ted kidnap the Princess Babes to take them to the Battle of the Bands was notably different for several reasons. First, the robots knock Missy out, not with their breath, but with Evil Bill's fist! In early drafts of the script, Captain Logan also confronted the robots, only to be pushed up into the ceiling by them. The robots then pull an outrageous bluff by unzipping their skins to reveal themselves to be disguised . . . as each other! (This would have tied in with Rufus' revelation of actually being Ms. Wardroe at the end of the movie.) If you look closely while watching the movie, you can see the discarded skins on the floor behind Evil Bill and Ted, as they talk to Bill and Ted on the phone.