Spencer's squirrel camera from iCarly and Gibby's head were seen being held by Henry in the opening scene at Junk 'n' Stuff. Additionally, Charlotte's duck mask seems to be the one that Mandy Valdez from iCarly used.
This episode was in production from November 17 to November 21 of 2014.
The t-shirts say fum instead of fun. This is a nod to SpongeBob SquarePants where Patrick spells "Chum is Fum" instead of "Chum is Fun."
When Henry and Charlotte are in the Junk store at the beginning, the fake head they take out of the box and put on the piano is Gibby's head from iCarly.
As Ray and Henry tussle, and when Charlotte later calls Henry "chubby," Henry is shown wearing gray underwear with a black band.