Overarching themes in storys

I realized lately that many great Storys have some event or object that only appears at the beginning and the end. For example:
Spoilers for Harry Potter, Inheritance Cycle, Black Magican´s Guild, Starwars, Anthropology,Five Score Divided By Four and Age of the Five below this

-the flying motorcycle in Harry Potter (it brings him to the durselys in the beginning and away from private drive 4 at the end)
-the dreamsequence in Eragon wich shows the ending of Inheritance
-Sonea´s aunt and uncle not living in the Slums in the Black Magicans Guild Triology (they are thrown out of the city at the beginning of book 1 and live in the city again at the end of book 3)
-the Deathstars (being blown up by an X-Wing) in Starwars (exluding the maw-facility in the expanded universe)
-Lyra eating Bon Bon´s cake in Anthropology
-Auraya not being a priestess in the beginning and at the end of the Age of the Five triology
-[Edit, new] the shots in five score divided by four