Like most cartoons, the people in the Simpsons have 4 fingered hands (3 fingers and 1 thumb), and similarly 4 toed feet, as it is widely found to be difficult to fit in 5 fingers so that they look correct and the hand doesn't look large and crowded. However, here both God and Jesus have 5-fingered hands and 5 toed feet.
Lisa says her story is "unaffiliated with Disney... unless we're now owned by Disney." This is a nod to Disney gaining ownership of The Simpsons on 1 January 2019.
Lisa compares her story to a Disney Princess movie, then sings a song about wanting less. This is a joke on Disney princesses often singing about wanting more, as in 'The Little Mermaid,' 'Beauty and the Beast' and 'Pocahontas.'
Two former Saturday Night Live (1975) regulars, Jon Lovitz and Tracy Morgan, play themselves in heaven, although both are still alive.