Looking for a word

[sgobowinski]

There is a word used to describe something said which is seemingly inconsequential or benign at the time which is later proved to be very significant when more information is known or in hindsight. What could it be?

[knowable]

Theorem?

[andrewdee]

An aside?

[sontosidadai]

Riddle perhaps

[knowable]

Monumental? Instrumental? Consequential?