Just a little fun with some terms:
Chekhov's gun
It
is a metaphor for a plot device or foreshadowing, which if shown or discussed
should be used later.
Red herring
A
false clue that leads the characters toward an inaccurate conclusion within the
plot of a story, considered to be the opposite of Chekhov’s Gun.
The
Chewbacca Defense is starting to come into the lexicon as a famous Red Herring
It refers to a South Park episode and refers to using something so patently
absurd that it makes no sense and creates confusion.
MacGuffin
"[We]
have a name in the studio, and we call it the 'MacGuffin'. It is the mechanical
element that usually crops up in any story. In crook stories it is almost
always the necklace and in spy stories it is most always the papers".
--
Alfred Hitchcock
A
plot device that provides the initial motivation for a character, and it may or
may not end up coming back into the story at the end.