As T'pol talks to Archer about how disruptive the Orion women have become, listen very carefully to the background. A "sonar" ping from The Original Series can be heard only once.
When Trip arrives on the bridge to stop the Orion women, his uniform carries Enterprise's patch, not Columbia's. However, in the final scene while walking with T'Pol, Trip's uniform again carries Columbia's uniform patch.
Mission Date: December 27, 2154
Nitpick: Even after Phlox reveals the males are vulnerable to the Orion women, Archer and T'Pol put a male MACO in charge of guarding them. Even if Archer was delusional, why would T'Pol allow it?
Goof: When Trip sees Kelby talking to the Orion woman in Engineering, he incorrectly refers to him as Lieutenant, despite Kelby clearly wearing three pips for commander and Trip's earlier acknowledgement of Kelby's promotion to Chief Engineer.
Trip: Why don't you just say it?
T'Pol: Say what?
Trip: That you want me to come back.
T'Pol: I believe I did. I think your presence here would be extremely beneficial to our operation.
Trip: No, that you want me back.
T'Pol: I don't know what you mean.
Trip: My mistake. See you around.
T'Pol: Wait. Trip. (he turns) I want you to come back.
Trip: Then I'll think about it.
T'Pol: Trip! (he turns, she kisses him)
Trip: The thing I can't figure out is why I'm immune.
T'Pol: That might have something to do with me.
T'Pol: There's a long-held belief that when a Vulcan mates... there's a shared psychic bond.
Trip: We didn't... mate.
T'Pol: (under her breath) Uh-huh.
Trip: I think Kelby can handle them (the repairs). He's been observing my work pretty carefully. . . when he wasn't trying to blow up the ship.
T'Pol: A Vulcan science vessel surveyed the seventh planet over fifty years ago. The file states it's an M-class world with a flourishing ecosystem, no intelligent life.
Archer: Sounds promising.
T'Pol: They did report one distinctive feature which bears mentioning.
Archer: And that is?
T'Pol: A species of flying reptile. Some reportedly over two hundred meters long. They're also said to breath fire. There's been lingering questions over the accuracy of this report.
Archer: Can't wait to find out.
Archer: (speaking to T'Pol) It almost sounded like you were making a joke.
Trip: At least trying to make one.
T'Pol: I assure you, if I ever decide to make a joke you will know about it.
Orion Slave Girl: Commander Tucker, I'm impressed. I'm beginning to see who's the true master of this vessel.
Trip: Oh save it. Captain Archer runs this ship. You're sweet talking the wrong guy. Let's go.
T'Pol: (about the Orion women being in control) It proves that even the most disagreeable species have some positive attributes.
At the opening of the episode, the Enterprise is on its way to "Berengaria". T'Pol mentions that there are reports on Berengaria of large flying reptiles that breathe fire. In The Original Series episode "This Side of Paradise", Spock (under the influence of mysterious spores that make people happy) sees a cloud that looks like a dragon and remarks that he saw a real dragon once, on Berengaria.