Kang and Kodos wonder if speeding up time will allow the Chicago Cubs to win the World Series, a reference to the team's long-standing championship drought. As of 2016, it has been 108 years since the Cubs' last World Series win, and 71 years since their last Series appearance. Coincidentally this episode aired less than two weeks after the Chicago White Sox, the Cubs' crosstown rivals, ended their World Series title drought of 88 years.
It seems the Yes Guy, Principal Skinner, Groundskeeper Willie, Otto, and Sideshow Mel were the only Survivors who Survived to Escape from Mr. Burns. However, they could've been shot by Mr. Burns but it was not shown.
"I've Grown a Costume on Your Face" is similar to an issue of the Simpson ComicBartman, in which an Itchy and Scratchy brought to life through alien technology create a nuclear explosion which turns the Simpsons into costumed superheroes.
Bart says "Cowabanga" from the Teenage Mutant Ninja Turtles.
Kent Brockman: Flung from a tree, and was the last person to be shot out of the air.
Moe Szyslak: He was flung from the tree along with the others, but Burns missed him. After taunting Burns, he ironically lands on on a weather vane, impaling himself. He still survives, wins the lottery, and is about to leave to cash it in, but Chief Wiggum lands on him, crushing and finally killing him.
Clancy Wiggum: Falls on a weathervane and dies instantly, crushing Moe.
Professor Frink: Eaten by Homer, who passes up bananas, saying that they look green.
Sideshow Mel: Shot by Burns, using machine guns on a plane during a strafing run.