A Sound Of Thunder work

1. If you disobey instructions, there's a stiff penalty of another ten thousand dollars, plus possible government action, on your return."

2. People called us up, you know, joking but not joking. Said if Deutscher became President they wanted to go live in 1492. Because  "We're lucky. If Deutscher had gotten in, we'd have the worst kind of dictatorship. There's an anti everything man for you, a militarist, anti-Christ, anti-human, anti-intellectual."

3. First shoot the two eyes to blind them, then go back to shooting the brain.

4. First a day and then a night and then a day and then a night, then it was day-night-day-night. A week, a month, a year, a decade! A.D. 2055. A.D. 2019. 1999! 1957! Gone! The Machine roared.

5. It is a anti-gravity metal path that is stays six inches above the earth's surface, so the men don't touch and affect anything below / around them. 

6. Before the journey, the machine and the men's clothes were 7. When in the past, the men wear oxygen masks so they don't pass on any bacteria from the future to this area that may change the future.

7. The men wear oxygen masks so they don't pass on any bacteria from the future, because that could change the whole world.

8. They're not the ancestors of any living creatures of today / they will not be any use of the future which means that the men don't harm civilization in the future if they kill them.

9. Eckels jokingly pretends to fall off the path.

10. "I didn't realize it would be this big," said Eckels. "I miscalculated, that's all. And now I want out."

11. The men know which dinosaur they are allowed to shoot because the correct ones are marked with the red colour.

12. They sat on the pathway and threw up.