In each episode of the "Imaginationland" trilogy, Cartman appears dressed as a figure of authority. In this episode he is dressed as the Pope.

"Imaginationland: Episode III" was viewed by 3.9 million total viewers, making it the most watched telecast of 2007 on Comedy Central until "Guitar Queer-o" aired the following week. The episode was the night's most watched program in all of television among men aged 18 to 24 and men aged 18 to 34.

(A cameraman is setting up props)
Cartman: How does that look? Can you see my balls and the sundae in frame?

Robin Hood: We managed to fight off the vampires and werewolves, but.. now our troops are being shot down by the Cavity Creeps.
Aslan: Cavity Creeps?
Cavity Creeps: (advancing forward with cavity drills) We make holes in teeth! We make holes in teeth!
Wonder Woman: What can destroy the Cavity Creeps?
Perseus: Only Crest Gel with Tartar Control.

(Kyle is talking to the imaginary voices in his head)
Stan: Hang on Kyle, Jesus wants to talk to you.
Kyle: Huh?
Jesus: Hello Kyle. This is Jesus.
Kyle: Oh boy.
Jesus: What seems to be the problem my child?
Kyle: Jesus I can't do anything. I'm just a 4th grader going against the entire government. (after a pause) Hello? Jesus?
Luke: No. Hey Kyle, this is Luke Skywalker. Look, I know this seems like an impossible task, but do you remember when I brought down the Death Star? I mean, that seemed impossible too right?
Kyle: Yea I guess.
Luke: Okay now hold on because Superman is here and he wants to say something.
Superman: Kyle, this is Superman.
Kyle: Hi Superman.
Superman: I know that saving people can be a big responsibility, but no matter what it takes, it's worth it.
Kyle: I know.
Superman: You can do this Kyle. Now hang on because Hercules wants to talk to you.
Kyle: (annoyed) Oh God!
Superman: Yes, God is here too. He's going to talk to you right after Captain Crunch.

Visual: Nobel Peace Prize

Al Gore is wearing his Nobel Peace Prize medal in this episode. He, along with the Intergovernmental Panel on Climate Change, were awarded the Peace Prize at the 2007 ceremony.

Luke Skywalker: ..do you remember when I brought down the Death Star?

This is in reference to the original Star Wars film, or sometimes referred to as Star Wars: A New Hope. Luke Skywalker, guided by Obi-Wan, uses the Force to fire a shot from his ship that successfully destroys the Death Star, Darth Vader's space station that's capable of annihilating an entire planet.

Visual: Al Gore

First appearing in "Manbearpig" last season, Al Gore returns in this episode dressed exactly the same and still promoting Manbearpig awareness.