The amount of work it took boggles the mind. I noticed a few serious flaws:
1) There is no plant life
at all in WALL-E. EVE's entire purpose is to find if Earth can support plant life again. She finds one plant, and it winds up that means humanity can return. Fine and dandy, no problem at all. Except in Cars, though we see no animal life (aside from the dinosaur logo of the Dinoco company, which he didn't point out, oddly), plant life is
everywhere. So the machines sent humanity into space because all the plant life was dead and the world was literally covered in trash, then somehow got rid of the trash and brought back plants, sort of simultaneously evolved and devolved into the Cars, who apparently died out after they killed all the plants and covered the Earth in human waste again, and only one cleanup robot survived--all in a period of only a few hundred years, based on the portraits of the captains of the Axiom, which I believe had firm dates attached. Oh, and all the super-high tech we see in ruins in WALL-E is absolutely nowhere to be seen in either Cars movie. We should at least see some Cars driving around who look like they were manufactured after about 2005.
2) The Bug's Life bit is really problematic. I'm not sure birds are coming back after WALL-E, unless another ship out in space somewhere took animals along, and it returned. (There may be some animals in the end credits to WALL-E, I'm pretty sure at least some fish, but they logically shouldn't be there and there's no explanation given as to how they're back.) The bugs' world is made up of trash. Human trash. Most of it paper and cardboard, or at least containing those. After maybe a few hundred years, at least. People returned, then started generating the same trash they did before? The trailer bit is way the hell off. It's not established
where (or even when, to be fair to the author here) Randall is sent to, but the inhabitants of the trailer have heavy Southern accents and think Randall's a gator. IIRC, there's sorta Cajun-ish music playing in that scene. So probably Louisiana, maybe Florida, definitely somewhere along the Atlantic Ocean/Gulf of Mexico shoreline between the two (or, slim chance, as far north as South Carolina). A few hundred years, and the trailer's dirty and losing paint? Those things rot pretty quickly (relatively speaking), especially in wet environs.
Here's an image of a trailer I've seen in person in Bombay Beach, CA, along the Salton Sea shoreline, after it was abandoned for 30-40 years. There's more salt in the sea air there than the Gulf Coast, but the air's also much drier. Also, the trailer looked a lot worse than this pic when I saw it the first time (maybe five years later), and was even worse about two years after that.
3) Are we really supposed to believe that the heroes sucked into turbines in The Incredibles were murdered by sentient planes? Assuming these planes have the same sorts of personalities as the inanimate objects in other Pixar movies, why would they be so homicidal? Also, equating artificially intelligent machines with inexplicably living inanimate things is pushing it.
Nitpicking, perhaps, but if he put that much work in, he needs to expect to be nitpicked.
