The Bottle Fairy asking the riddle is an obvious Expy of Navi, down to repeating the infamous "Hey! Listen!" verbatim. And when the door opens, the notes that are present on screen are that of the Zelda door opening theme, just to add to it.
The vampire siblings are called "Ezra" and "Koenig". While these can be seen as ironic hipster names, Ezra Koenig is an actual person, the frontman of VampireWeekend.