Adaptation Displacement: Not everyone remembers the Disch book this was based on and even fewer are aware that the sequel is also based on a book, but that's not too surprising. According to Wikipedia, Disney had bought the movie rights to the first book before it was even able to get published! It doesn't help that both have since gone out of print.
Distributed by Disney. Actually a "joint venture" between Hyperion and Wang Film Productions in Taiwan. With the backgrounds, camera work, ink & paint, and most of the animation being handled by the latter. Disney does get credit in the movie for handling the main title and the opticals. Fox also financed some of the film (in exchange for the foreign rights).
Singers from the Disney Chorus also contributed to the songs.
Animation Age Ghetto: In his own words, Jerry Rees, along with his small team, set out to make a film that was sophisticated enough for adults to appreciate without relying on Beavis and Butt-Head-style humor, paying special attention to Character Development, using a professional Hollywood score (David Newman), and especially sound design (all of the sound effects are folly). Sadly, this trope still reared it's ugly head when the film screened at Sundance and the judges told Jerry Rees point blank that it was the best film there, but they were afraid of losing credibility for giving the honor to a "cartoon."
Ass Pull: Radio's tube is just the right kind of tube to save Wittgenstein. No matter that this tube is extremely rare and they have to go to Alaska otherwise to get one.
Awesome Music: The entire soundtrack, from DavidNewman'sgorgeous score to the well-written musical numbers. Also, if you listen closely to some parts of "Worthless" and "B-Movie" (most notably) you can hear spontaneous little bass guitar riffs that just make it THAT much more awesome.
And of corse, who can forget the Radio giving the appliances a "soul injection" from the be-bop master himself during the cleaning montage. "WAMP BAMALADA B-LAMP BAM BOO!"
Base-Breaking Character: Blankey. Many people find him annoying due to his childish nature, but he has just as many fans who find him adorable for that exact reason.
There's a rather egregious one in The Brave Little Toaster Goes To Mars when the appliances meet a group of balloons who floated away from Earth. Believe it or not, the scene was in the book, and wasn't a BLAM: Toaster and Crew picked up a balloon that helped them navigate their "spacecraft" and told them some of the Mars Appliances' backstory.
The song that computers sing about the "Super Highway" in the second film.
Much of the scene in the meadow doesn't have anything to do with the rest of the movie in the first film.
"It's A B-Movie Show" in the first film. It has little to do with the main story, and is mostly an excuse to make horror movie references.
Critical Research Failure: In To the Rescue, when the appliances ask the old computer, Wittgenstein, about how long he's been down in the basement with no use, he spits out an overly long number of nanoseconds as if to indicate he's been down there forever. If you actually do the math, though, it comes out as a little over an hour.
Cult Classic: Despite making virtually no money or impact on the general public due to how poorly it's distribution was handled, it is massively popular among children of the late 80s/early 90s who saw the film repeatedly on video and TV. Chances are, you've either never heard of this movie or you've seen it and love it. It helps that it's considered to otherwise be a top-notch movie in it's own right, meaning it has a healthy shelf life.
In particular, the violent death of Phil Hartman's Air Conditioner.
Both Hartman and the original author Thomas M. Disch died from a gunshot - the latter's death was a suicide (in 2008), giving the movie's bleak tone a rather depressing real-life element.
The little bit of trivia that Peter Lorre was a Jew who fled Nazi Germany can make his portrayal as a lampshade in this movie just a tiny bit unsettling. Not helped by being in the same movie as "to the showers!" and a scene of the heroes getting briefely trapped in an oven during a scary song.
Hilarious in Hindsight: "We are on the cutting edge." Also, the song "Cutting Edge" (sung by, among other things, a Tandy-style computer) was a satire of consumerism featuring modern technology singing their own praises. But to a modern audience, it's hilarious when you consider that nearly every single one of those cutting-edge appliances is now severely obsolete. The hilarious irony only grows with each passing year.
Mr. Tandy, meet Mr. iMac!
Mrs. Phone, meet Mr. Blackberry!
There's even a fan-made YouTube video of "Cutting Edge" featuring the real-life appliances similar to those from the movie, and their comparisons with modern-day 21st century appliances we still have and use today, all together in a collage. (Check this out!)
A meta example: John Lasseter was fired from Disney for badgering them to make this film with hand drawn characters in a CG environment. which was not considered time- or cost-effective enough. A year before this film was released, The Great Mouse Detective used this exact method to huge success and it became one of their biggest assets for all of their future traditionally-animated films.
Jerkass Woobie: Air Conditioner. Even with his initial smug attitude, it's hard not to pity him after seeing his insecurities of immobility get to him. And then we see him tear up after the Master repairs him.
Moral Event Horizon: The electromagnet crane could probably qualify as Punch Clock Villain, but when it continues its pursuit of the protagonists even after they were claimed by the Master, going so far as to nearly kill him in the process, all bets are off.
In the novel version of The Brave Little Toaster Goes to Mars, the main villain was an ancient hearing aid created by Albert Einstein, who went insane after being used by a Nazi party member, then escaped to Mars, inhabited a giant refrigerator, and amassed an army of "Populux" appliances ("Wonderluxe" in the movie), with the goal of returning to Earth and killing all the humans in revenge for planned obsolescence schemes. Seriously. And it became an animated movie as well.