At one point after Wittgenstein's tube is replaced and he is restored to perfect condition, he is seen from behind and a vent is missing, leaving wires exposed. This is how he looked before being revived, but not after.
When they enter the vent to find Wittgenstein, Ratso is seen out of the vent talking to Kirby. He never enters, yet we see him later, running with the rest.
During the song "Remember That Day", Toaster puts garbage into his slot and then shoots it out like confetti, where it then is seen falling all over the office floor. It then shows the office in perfect condition, then goes back to Kirby vacuuming up the mess.