The beat of the Cookie Cat rap was made on a Gameboy.
"Steven's Shield", the song that plays when Steven activates his gemstone, was the first piece of music composed for Steven Universe.
If one looks closely, one can see that the recurring TV show, Crying Breakfast Friends!, was airing on Steven's T.V. when he got home.
The Crystal Palace, referred to in the Pilot, is now called the Crystal Temple.
When Steven opens the freezer and you see all the Cookie Cats, you can also see Connie's glow bracelet. The same bracelet he returned to Connie in "Bubble Buddies".