Referencing previous material like this is commonly called a callback (just like programming :-). It's extremely common to end with at least one call back.. if

Referencing previous material like this is commonly called a callback (just like programming :-). It's extremely common to end with at least one call back.. if not multiple. https://en.wikipedia.org/wiki/Callback_(comedy) https://en.wikipedia.org/wiki/Callback_(comedy)