At one point Chef's father tells the kids that the first time he and his wife saw the Loch Ness Monster was about seven or eight years ago. Later he tells of another time he saw the Loch Ness Monster when Chef was just three years old.
The eye doctor gave Cartman nitrous oxide to do the laser eye surgery. Nitrous oxide knocks the patient out while they are breathing it, but a patient would have to be fully conscious for laser eye surgery. Eye doctors don't even stock nitrous oxide.
On the page defining succubus, eerie is spelled wrong.
Chef and the Succubus sing incorrect lyrics to the song "Morning After." They sing the chorus as, "There's got to be a morning after, if we can hold on to the night" but the actual lyrics are "There's got to be a morning after, if we can hold on through the night".