YKTTW is up.
Here's what I've got for the current description:
The thing about adaptations and remakes is that they often have to tell the same basic story as the original work
in a reduced span of time
. Sometimes this leads to stuff being introduced relatively earlier than the original brought them into the picture. This can apply to characters, tech, plots, almost anything, but the basic principle is the same regardless.
This is easier to see when items are introduced in a different order than in the original: whichever item(s) appear first become examples of this trope. This is by no means required, however.
Compare <insert tropes here; I got nothing ATM>.