This episode officially confirms that Good Luck Charlie , Jessie , Shake It Up , and Austin & Ally all exist within the same continuity.
Much of the second half revolves around the characters trying to reconstruct their "wild" Christmas Eve. [S4E17] Good Luck Jessie NYC Christmas
Debby Ryan (Jessie) performs her holiday song, "Favorite Time of Year," during the special. This episode officially confirms that Good Luck Charlie