Not to mention that WALL•E's "fully charged" and reboot sounds are the same as the iconic Apple start-up sound.
While we're on the subject of Apple, AUTO has that Creepy Monotone because he's voiced by MacinTALK, Apple's text-to-speech program. M-O's "FOREIGN CONTAMINANT" directive is synthesized by the same.
There are at LEAST three visual references when WALL•E is traveling in space. The solar flare before going to the ice rings references the opening of Star Trek: Voyager. The drones flying out of the shuttle bay reference the runabouts from the opening of Star Trek: Deep Space Nine and during the approach to the Axiom, the music sounds like the approach to the Death Star in Star Wars.
There's an obvious reference to The Matrix, with the highly meaningful clothing shift from blue to red by the culturally awakened Muggles.
The captain trying to reattach the plant's leaf looks ecxactly like Al doing the same to Woody's arm in Toy Story 2.
It's subtle, but as EVE is first exploring Earth, the background music is very similar to the theme for Raiders of the Lost Ark.
It also gives of vibes of R2-D2 wandering through the valley in A New Hope.
The world as a whole may be a Shout-Out to either Mad Max or the Fallout Series. You know, except with more garbage, especially the juxtaposition of nostalgic music and imagery from happier, more innocent times with the bleak reality of the future. Heck, the film even opens the same way as the Fallout games' opening cinematics - golden oldies and comforting visuals that suddenly segue into a desolate post-apocalyptic cityscape.
WALL•E and EVE's first "rogue robots" picture looks suspiciously like the posters for Wanted (right down to the poses and coloring), which coincidentally came out the same day (June 27, 2008), and which both have titles that start with the same letter of the alphabet.
The company that makes everything, Buy N Large (abbreviated "BnL"), seems to be a more obscure reference to an album by the Barenaked Ladies (also abbreviated "BnL"). The artwork for the 2003 album, entitled Everything to Everyone, features the band posing in various everyday situations while using various products that come in blue boxes marked "Everything". Still not convinced? A close up of one of the boxes had "BnL" in the corner.
There's another 2001: A Space Odyssey reference in the BURN-E short. When the ship goes into hyperdrive, it mimics the light show that Dave sees when he goes though the Monolith. It even reflect on BURN-E's visor like it did on Dave's.
The fact that WALL•E's TV is made up of a small iPod screen and a big magnifying glass would appear to be a shout out to Terry Gilliam's Brazil.
The first trailer for WALL•E even has the song "Aquarela do Brasil", which Brazil is named after, in the teaser trailer.
The "HALT" that the stewards say sounds almost the exact same (except for a pitch shift), as the HALT repeated endlessly by guards in the old game The Elder Scrolls: Daggerfall.
WALL•E himself bears a strong resemblence to Johnny-5; though Word of God states this was unintentional, he admitted it may still have influenced the design.
Later, while wandering through the piles of junk, EVE briefly gets stuck to a giant magnet.
To say nothing of compacting junk into tiny, neat cubes.
Buy n' Large's slogan is similar to the chorus in the song "Cutting Edge": "Everything you wanted and more!"
A rather odd one: when the computer is defining "Earth" to the Captain, the Early Films classic A Corner In Wheat is briefly visible on the screen.
WALL•E bears more than a passing resemblance to Charlie Chaplin's Little Tramp character. In particular, his experiences in the Axiom robot repair ward are reminiscent of Modern Times, while his recognizing EVE by holding her hand recalls the end of City Lights.