In preparation for their time jump, Travis introduces Eckles and Middleton to the weapons they'll be using to take down the Allosaurus. Travis explains that these bullets are made of frozen nitrogen, to Middelton's outrage: "We're gonna be takin' down a dinosaur with ice?!"

FAIL #20
Marcus proceeds to demonstrate the power of these "ice" bullets, by blasting a large concrete target to smithereens. Travis presents this as demonstration of the second rule of time jumping: don't leave anything behind. If this is supposed to make us feel better about the fact that they're not leaving actual bullets in the past, it's not working, unless we consider an alternate interpretation of the phrase "don't leave anything behind."

Next, Dr. Lucas administers several painful injections to Eckles and Middleton, taking this as his cue to explain the third rule of time jumping: don't bring anything back. Interestingly, Dr. Lucas appears to have a quite keen grasp on the cataclysmic stakes of their situation:

No matter what, no matter how small, never change anything in the past. Nothing. You kill a bee, maybe the flower it was going to pollenate doesn't grow. And the seeds it was going to spread don't get spread. And the animal that was going to eat the vegetation doesn't have the food to eat, and it dies. And it was carrying the genes for a new kind of animal which doesn't get to occur. And it alters the course of evolution. A single bee. And the farther back you go, the more catastrophic any changes could be.

FAIL #21
On a side note, Dr. Lucas kind of drops the ball by using a bee to explain something actually named "the butterfly effect." Perhaps it's the language barrier.

FAIL #22
Study question: Does it make matters better or worse that someone working at Time Safari actually understands the potential consequences of what they're doing, but thinks inoculations and bee talk are totally adequate safety precautions?

It should also be noted that Middleton closes this scene by reminding Eckles of his "brass balls," demonstrating Middleton's continued fixation on his friend's testicles. Such understated homosexual undertones provide the true emotional center of A Sound of Thunder, as the viewer hopes not only that mankind's future will be saved, but that gay marriage will finally be legalized.

FAIL #23

Yes, Jeffrey still works here. And yes, he is single-handedly responsible for operating this time jump.

Finally, the entire team, suited up and ready to go, is secured in some kind of time travel chamber. Eckles is already getting nervous:

Eckles: Oh my god, it's so tight, I can't move! Does it have to be so tight?
Marcus: We are going to enter the virtual receiver. You've gotta stay still, or the particle beam will not hit the right spot. You want all those atoms winding up in the same place, and as the same people.

Perhaps Eckles might not have agreed to continue participating in this activity had anyone actually informed him that not holding perfectly still could result in his atoms being scattered willy-nilly through space and time. Fortunately, Travis has a special talent for easing clients' stress in such dire circumstances:

FAIL #24
Travis: Whatever you do, don't look into the light. Just kidding guys, remember, this is supposed to be fun!

This approach has obviously worked on Middleton, who roars with laughter while Eckles whimpers pathetically. The team zips away into the past.

FAIL #25
12 seconds after Dr. Lucas reminds everyone, "Remember, don't touch anything," Eckles aims his gun at a butterfly and pulls the trigger repeatedly. While Travis's safety mechanism successfully prevents Eckles's gun from firing, this does seem like a moot point since they're just going to turn around and kill a dinosaur anyway.

FAIL #26
Marcus: Hey Derris, how about we don't mention this in our report?
Derris: No harm, no foul.

After the team reaches their destination and before the Allosaurs shows up, Middleton catches a glimpse of the volcano in the distance and marvels, "Check it out!" This might be a sign that he, or someone else, or many other people, might have paid good money to travel back in time just to take picture of such awesome sights, as opposed to the zero public interest in such a service lamented earlier by Travis.

FAIL #27
When the Allosaurus arrives as expected, Travis attempts to fire the first shot as usual, but his gun is broken and won't release any of the other guns to fire either. So now everyone is being attacked by a killer dinosaur and they might as well be armed with corndogs. Truly, the most embarrassing part of this situation is how preventable it was.

FAIL #28
In fact, the prospect of any kind of "Plan B" was so far from ANYONE'S mind throughout the conception, development, and operation of Time Safari that Travis's best idea in this situation is to run around with a flashlight screaming, "Take me on! Take me on!" Meanwhile, Jenny has the brilliant idea of waving her own flashlight to lure the dinosaur back to where all the people are, as Marcus attempts to fix the gun with a melted hole in it that no one noticed before embarking on this time jump.

FAIL#29
Marcus finally does fix the gun, however, and proceeds to hurl it in the air for Travis to catch on the other end of a narrow walkway hovering over a tar pit. This seems like a much better idea than walking over and handing it to Travis, considering this miraculously repaired gun is everyone's only hope for survival, and if it falls in the tar they all get eaten and future humanity will turn into catfish.

FAIL #30
Travis distracts the Allosaurus by throwing his flashlight in the air to make it look up, so he can shoot it through the bottom of its head. This leaves the flashlight bouncing all over the walkway, and it is barely caught by Jenny as she literally dives to save it from falling in the tar and... well, you know.

FAIL #31
Derris: [The Allosaurus] fell right where he was supposed to... Did anyone break any protocols? Then we're clean!

FAIL#32
As the team heads back to the portal, the camera pans down to reveal a muddy footprint on the walkway, indicating that someone has broken the rules and stepped off the path.

Back in the present, Middleton is furious with Hatton over the mishap during their time jump. However, Hatton successfully convinces him that this incident puts them on par with Columbus discovering America or Brubaker landing on Mars, so Middleton sips champagne and apparently decides not to sue Time Safari at all for almost feeding him to an Allosaurus.