The episode title name references Steven Universe episode of the same name.
The same followed by "Regular Show", which also used the name except its entitled with "The" Part.
This episode reveals that Mel has speculated that the family has a tradition of going to summer school.
"NASU" is a reference to "NASA", A famous space organization.
Pop Culture References
Belson plays a toy game similar to the popular retro toy game "Bop It!".
Chad's metaphor "Life is like a Box of Doughnuts, you never know what you're gonna get" is a reference to Forrest Gump's metaphor "Life is like a Box of Chocolates, you never know what you're gonna get".
Gilben's rocket resembles the Monolith from 2001: A Space Odyssey.
When Jeff reads a book, a spy can be seen as John Doe from Roblox.
Ms. Baker's front teeth disappear and reappear when she explains the power of the moon to Clarence.
When Sumo, Jeff, and Clarence are outside (their rocket is done but they are not at the school), the tinfoil heart is on the tip of the rocket, but in the next scene it is not (it later reapears when Clarence claims it as a token as his new friendship with the moon