Nitpick: Archer seems to think that the humans on the planet would be safe. By this time it is well-known that the Xindi want all humans killed and have been tracking Enterprise. The humans on the planet now appear to were in more danger now than before.
Goof: Bennings shoots Bethany on her exposed left side, but when Dr. Phlox is pulling the bullet out, he's taking it from the right. Later when she's commenting on how she doesn't have a scar from it, she's looking at her left side again.
Bethany: You must think we're barbaric. All the things humanity's accomplished--building ships like this, traveling to other worlds and we're still down there shooting each other.
Archer: The progress on Earth, it didn't happen overnight.
Bethany: But it was progress all the same. You've managed to change. We haven't. Even if you could take us back, I don't think we're ready.
Archer: It may be a while before we're able to start sending ships here. My guess is, by the time they arrive they'll find things have changed.
(To Draysik when Deputy Bennings is taunting him to shoot him)
Archer: Excuse me, do you think I could get some more coffee before you shoot him?
(After Trip gets on a horse)
T'Pol: Do you have any experience riding these animals?
Trip: I've seen every John Ford western.
When T'Pol is being held, Malcom stuns her with a phase pistol fire, cocks his head, then stuns the man who had been holding her. The situation, action and gesture are almost identical to the scene in the 1994 movie Speed, in which Officer Jack Traven (Keanu Reeves) shoots his partner, officer Harry Temple (Jeff Daniels), being held captive by the mad bomber (Dennis Hopper).