There are two jokes referring to Sandy Duncan's glass eye. While she did in fact lose sight in her left eye due to a tumor, she doesn't really have a glass eye.
When Stewie goes through airport security on his way to Los Angeles, he takes off his shoes and leaves them on a counter. He never puts them back on but when he gets in the limo, he's wearing them again.
Peter claims he hired the entire tribe to re-enact the "Contest" episode of Seinfeld. But the line from the high priestess of "you can't spare a square?" is from "The Stall", not "The Contest."
After going through the metal detector in the airport, Stewie never puts his shoes back on or gets them back.