Well, Mr. Kitty is not a Mr. after all.
The notch on Mr. Kittty's ear is sometimes on the left ear, sometimes on the right ear. (spotted by Tess Woodward McGill)
Wild Animal World = Mutual of Omaha's Wild Animal Kingdom
The Wild Animal World segment Kitty watches on TV is the same one used in Natural Born Killers, when Harrelson watches TV in a hotel room after having kidnapped a woman.*
The note on the refrigerator reads "Call Cartman's Mommy at…" but Cartman reads "Call Eric's Mommy at"
A twelve-year old girl with a 22-year old boyfriend? I've seen it happen…
You're my only hope! - from Star Wars Episode 4: A New Hope, where Princess Leia records a note to Ben Kenobi and sends it via Artoo Deetoo (R2D2).
When Shelley drags Cartman across the living room in front of Skyler's band, there's no keyboard next to Skyler. When he begins singing "Shelley," it appears.
There's quite a similarity between Jonesy and the guy demonstrated by Dr. Vos Knocker in his V-chip presentation, only Jonesy's hair is brown.
Apparently, Mr. Mackey doesn't seem to mind that Liane is a hermaphrodite.
Saturday the 12th - Well, June 12 was a Saturday…
The song Kitty listens to is the same one Big Gay Al plays in his ballroom.
There was a car in the driveway and a van on the street. Skyler drives off in the van when he dumps Shelley. By the time Kitty returns home with her new friends, the car is gone, too. Who took it?
When Skyler returns home after realizing he's been tricked, he finds his guitar broken and stuck in a pile of cat litter. There are no wooden shards there, and the box says "KITTY" on it. When the camera zooms out to include Skyler in the shot, wooden shards appear and the box says "KITTY POO POO" on it.
When Cartman chews out the cats, the shot looks a little squished from the sides.