The Ungroundable/Trivia

Goofs

 * When Butters first becomes a vampire, we can see his fang-teeth while he is laughing. The only problem is his fangs have only two other teeth between them instead of four, but we can assume this is just the cartoon-style, just like Eric Cartman has four fingers on each hand, like most people in South Park, but five toes on each foot (which can be seen in many episodes and also in this one when Butters invades Eric's bedroom to give him a "hickey").


 * Toward the end of the episode, where Butters comes home from the mall, Stephen Stotch asks his son, "Would you mind telling me why there's Rice-A-Roni in my coffee?!" He illustrates his point by pulling a spoonful of pasta from his coffee mug, but while holding the spoon in his left hand, another reappears in the mug. When he replaces the spoon, there is still only one in the coffee mug.

Trivia

 * The Goth kids are once again mistaken for another group of people, just like the were called "Emo kids" in "Breast Cancer Show Ever", as reference to how Goths and Emos are similar, but much different in their own styles.


 * When Butters is scaring the vampires with a cross, we can see a logo resembling the one of the grunge band Nirvana on Vampire's jacket.


 * There is an achievement in the Xbox Live Arcade Game Let's Go Tower Defense Play called "Ungroundable". It is related to this episode.

References to pop culture

 * This episode is relevant to the then-recent new movie and Book Saga Twilight, by Stephenie Meyer


 * In the beginning of this episode, the kids are seen in the computer lab playing Call of Duty: World at War on the Castle map.


 * The scene where the boy is asking where his ball is very similar to the scene where Craig was asking for football in the episode The List.