The Death Mall is a Mall built on the Death Ball. Dark Laser pointed out, in quote, "I call it 'The Death Mall on The Death Ball'. It was built by my best friend Saul last Fall, He's tall,I should give him a call" When Timmy's fairies come to rescue him, they got distracted and went on a spending spree in it.
Cosmo got a job in a restaurant called "Head on a Stick",a parody of "Hot Dog on a Stick".
Wanda pointed out there is a store called "Doomingdale's",a parody of "Bloomingdale's"