Chief O' Brien seems to have undergone a serious demotion from The Next Generation to Deep Space 9. In TNG, he was a lieutenant, and when he started on DS9, he wasn't even an ensign. [In The Next Generation, O'Brien is seen to be wearing Lieutenant pips, but in an early DS9 episode, it is mentioned that if he left DS9 he would have to "give up (his) promotion", so it appears he didnt get demoted. And in several episodes, ("Armageddon Game" for example) O'Brien notes that he is not an officer in starfleet, merely an enlisted man, or petty officer. Petty officers dont get ranks like lieutenant. When he got transferred to DS9, he was promoted to Chief Petty Officer, hence why everyone calls him Chief. I would guess that the creators of The Next Generation didnt expect him to be such a major charachter later on, so didnt give much thought into his rank and history when he was created, hence why he was a lieutennant in TNG.]

At Jadzia's insistence, Benjamin goes to find Jake when he doesn't show up for dinner. To do this, he asks the computer for his location. As shown in "Dax" and "Captive Pursuit," Deep Space Nine's computers rely on commbadges to locate specific people, just like on the Enterprise. Jake doesn't wear a commbadge, nor does he appear to have anything similar, so how did the computer find him? [As the episode does not specifically indicate what method the computer used to determined Jake's location, there are rather simple explanations for it knowing where he was. First, he and Nog are carrying electronic equipment similar to PDAs, and these devices have been known to access the main computer, so if Jake's PDA is accessing the computer from Cargo Bay 14, the computer can imply Jake is there. Also, a cargo bay can require coded access so that Jake had to tell the computer he wanted to go in. Similar restrictions have also been shown in other episodes.]

Once again, a technical detail overlooked regarding runabout transporters. After transporting the alien column to the runabout, Dax tells the computer to realign the transporters to beam them aboard. Once again, a party of more than two people was beamed up by a runabout at the same time. The writers seem to keep missing that technical detail... Federation runabouts can only handle two people at once in their transporters. [Parts of runabouts, like sensors & torpedo launchers, are able to be upgraded depending on the mission; so additional transporters could have been installed.]

The rescue team is taken down the Bajor in a Federation runabout, capable of beaming up only two people at once, as established in a previous episode. Yet when the team finds Major Kira, Sisko calls to Chief O'Brien to beam them up. All five of them are promptly energized at the same time. [A basic runabout can be upgraded in a number of ways to include more sensors, torpedo launchers & phasers. Whats to say they can't do the same with the transporters to hold more people?]

As Jem'Hadar ships approach the Defiant, Commander Sisko orders main power to be cut. We see the overhead lights on the Bridge go out. The next scene shows Kira walking into Odo's quarters. Behind her the overhead lights in the passageway are still on, as are the lights in Odo's quarters. [In Defiants corridors there's no source of light other than the lights themselves, so the lights would have to stay on so that people would be able to get to safety or to duty stations.]

Even though this episode's future is an alternate future, the ranks of both Bashir and Jadzia are incorrect according to the time. They both have the rank of Commander which is inconsistent to their age and to Nog's promotion to Captain. They should have the rank of Admiral or even retired from Starfleet. [There is no reason to assume that they would be admirals at any specific point of time. People are not promoted simply because they have gotten older. It is a combination of personal merit and the current needs of Starfleet. And so far as retirement, life expectancy is different in the future so there is no reason to believe that they would have retired at any specific age unless we are told a specific age at which starfleet officers retire in that century.]

The episode completely contradicts what we've learned about Bashir and his family from previous episodes. In 2-6 "Melora" Bashir told her that his father was a Federation diplomat. If so, wouldn't some of the high-ranked people in Starfleet know about his family life? Having a son with birth defects certainly would not have been that big a secret and Richard certainly wouldn't have gotten away with having Julian enhanced if he chose to do so. In 3-18 "Distant Voices", Julian's mind was viciously probed by a Lethean, who via this contact knows everything about him. Of course, there was no mention of the genetic enhancements here, otherwise the evil alien would have easily used the secret and its illegality against the doctor. In another episode, Julian said he was very skilled at sewing up his teddy bear at the very young age of 5, which seemed to be the first indication of his desire to be a doctor. But as "Doctor Bashir, I Presume" indicates, Julian was genetically enhanced around his seventh birthday. If he was indeed physically and mentally deficient at the age of 5, he would have been completely incapable of patching up little Kukalaka. [In 3-18 Bashir could easily hide things from the lethean if he wanted, he has shown he has the mental capcacity to do this sort of thing. Bashir could have been lying about stitching up his teddy - maybe to impress whoever he he was telling. also having a child with learning difficulties isnt something most people would go around telling everyone, even if it isnt that big a secret, so possibly not many people knew, and they changed his name afterwards and switched him to a new school, so people wouldnt necessarily realize or connect the two. we also know from Doctor Bashir, I Presume that Bashirs dad changed his jobs frequently as well, so maybe he didnt have many close friends to tell about his son. so it may seem unlikey but it is possible for this to have happened and no one found out.]

In the first episode of season 5, Starfleet issued new uniforms, a redressed version of the 'casual duty uniform' from the earlier seasons and what would amount to as the 'standard duty uniform' from Star Trek: Voyager. The only problem is that Captain Sisko was wearing his combadge well into the grey part, and not on the black part of the uniform, like everyone else. He never does it again, only for episode one of season five. [Starfleet seems to allow a certain amount of leeway with uniforms, such as having the jacket open to different lengths. As long as Sisko can reach the badge, and it doesn't affect his duty in any way, I'm sure that Starfleet isn't bothered where he puts the badge. ]

Joran complains once or twice about how Jadzia and Curzon buried his memories, but Curzon wasn't aware of the memories to bury them. We learnt in Equilibrun that the Symbiosis commission put a memory block on the memories, and only when the block broke down did Jadzia gain access to the memories. Joran should know this, as he would have access to Jadzia's memories of this event. [Joran is an unstable personality whose recollections can't necessarily be taken at face value. Furthermore, since the collective memories are carried in one symbiont, the block affects more than one personality's memories.]