The Veldt
Sounds of Thunder
The Sentinal
100

An African Savanna - wide open grasslands

A Veldt

100

Name of creature Eckels pays to go back and time and kill

Tyrannosaurus Rex (T Rex)

100

Location of the expidition

The moon

200

a room in a house for the special use of young children

A nursery

200

Name of the company that offers expeditions back in time

Time Safari, Inc

200

Narrator was cooking this when he spotted the glimmer on the mountain

sausages

300

This was why Peter and Wendy having a tantrum near the end

George had shut down the nursery
300

This gives Eckel proof that the present has been altered by him stepping on the butterfly 

The sign changes

A different president

300

The shape of "the machine" that was discovered

a pyramid
400

The wallet and the scarf found in the nursery indicated that the lions were possibly eating who

George and Lydia Hadley (the parents)

400

This is on Eckel's foot when he returned

A butterfly

400

Narrator reason of joy when he finds the machine

He discovers that there are other civilizations besides us

500

The name of the house the Hadley's live in

Happylife Home

500

Eckels consequence for stepping off the path, directed by Travis before heading back to 2055

Collecting bullets in the TRex

500

someone or something stationed to guard against and warn against danger

Sentinel