"We guarantee nothing"
Forshadowing is when you hint what's going to happen in the story and also at the end.
The Sound of Thunder uses forshadowing to make it more interesting and make the reader to feel read more.
For example in the start the writer wrote down
"TIME SAFARI, INC.

SAFARIS TO ANY YEAR IN THE PAST.

YOU NAME THE ANIMAL.

WE TAKE YOU THERE.

YOU SHOOT IT."

this for using forshadowing to hint whats gonna happen.
In the title "Sound of Thunder" it is also a forshadowing because this gonna happen at the end.