A character mentioned by Squidward in the episode "Graveyard Shift." The Hash Slinging Slasher supposely came whenever the lights flicker on and off, the phone will ring and nobody will answer, and that his ghost will appear on the bus.
Mario was mentioned by Patrick in the episode "The Bully." Mario apparently works at Pizza Castle. He was mentioned by SpongeBob in "Suction Cup Symphony" when he thought Squidward "ate at Mario's", the night before.
A location mentioned by Girly TeenGirl in the episode "The Slumber Party." Girly TeenGirl says she moved from there to attend Pearl's slumber party. However, Pearl didn't believe her (thinking it was SpongeBob in disguise) and she and her friends drove Girly TeenGirl away. As Girly TeenGirl (who is revealed to be not SpongeBob in disguise) is running away, she says while crying "I am so moving back to Farawayville!"
A location that was mentioned by the narrator in the episode "Mermaid Man and Barnacle Boy III." Mermaid Man and Barnacle Boy went on a vacation to this place while SpongeBob and Patrick watched over their lair.
A restaurant mentioned by Patrick in "The Bully." Pizza Castle may be a parody of Pizza Hut and is a restaurant that serves pizzas. Mario is a known employee that works there.
A location mentioned by Squidward in the episode "Idiot Box." Squidward wanted to arm wrestle with robots on the moon and thought that SpongeBob and Patrick could take him there. However, Squidward is angred not to do so and, a little later, Squidward heard noises of Robot-Pirate Island from the box.
A type of food sold at the Chum Bucket that was first mentioned by Plankton in the episode "F.U.N." after SpongeBob knocked on the door. Plankton said "Our special today is Chum... Balaya". As always, it is marked with a "new" sign on the menu. It is never seen in the show. The name is a parody of the Creole dish, Jambalaya.