Speed up Episode 4 so everyone sounds like they've been huffing helium, in order to make more time for gratuitous CG guest appearances from characters intro'd in later (or earlier) episodes. Such as:
Ewoks fighting jawas in the back alleys of Mos Eisley ... A totally random sequence in cloud city ... Wattoo skulking about the Lars homestead or the sandcrawler after the slaughter, fighting off wamprats.
But the key thing is the high-pitched sped up vocals.