Corrected entry: On the Pasteur, when Data reports another ship de-cloaking, he says "It's the Enterprise." He uses a contraction rather than saying "it is." Even though it's in the supposed future, many times Data has pointed out he can not use contractions.
Corrected entry: Apparently when it came to taking the ship into the asteroid, the entire bridge crew conveniently forgot that Galaxy class federation starships can separate. The obviously prudent course of action would be to separate the ship and send the star drive section (the narrower section) into the asteroid while the saucer section (the wider section) stood guard outside. The only reason this wasn't done was to provide drama for the rest of the episode when the Romulans collapsed the entrance to the chasm.
Corrected entry: When 'present day' Picard talks to the Romulan commander, they each agree to send one ship into The Neutral Zone to investigate the space anomaly. But after this you never hear anything about the Romulans again. As paranoid as Romulans are, I find it hard to believe that they'd just let the Enterprise go play around in The Neutral Zone without keeping an eye on them. And there is no dialogue to indicate that the Romulan ship might be cloaked either; you'd think something with that kind of tactical import would be pointed out.
Corrected entry: All the humans on board evolve backwards to the primate stage of evolution. Lt. Barclay, however, appears as a half spider-half human hybrid when we see him in engineering. There are several things wrong with this: 1. Arachnids are not part of the human evolutionary chain. 2. All the other humans on board never de-evolve past primate stage, there is no reason why Barclay should have a speedier de-evolution into an even earlier stage. 3. Even if it were possible that Barclay could have arachnids in his ancestry, why is only half of his body arachnid and the rest human? Shouldn't his entire body be a part of the process, since it is his genes that are operating in reverse? NOTE: Barclay is listed as wholly human both on official websites and in the "Star Trek Encyclopedia", so these can not be explained by him being an alien resembling a human.
Corrected entry: In the scene where Troi, Data and Worf are going up the stairs, to follow the man with the gold brick, into Key Stone City after getting off the train. When they just got off of the train there is a sign on the railing of the stairs with "subway" written on it. In the same shot there is another sign on the railing with the text "New York City Transit System" on it. (00:24:30)
Corrected entry: When Picard is in the past and encounters Data for the first time, he calls him "commander Data". But as can be seen by the insignia on Data's collar (two pips, where a commander has three), he is only a lieutenant at this point. But for some reason nobody corrects this, not even Data, who is exceptionally accurate on all Starfleet protocol.
Corrected entry: When Picard realizes the paradox in Ten Forward, he and Data postulate that the time phenomenon began because three Enterprises in three time periods were generating the beam. However, in the future, the U.S.S. Pasteur generates the beam, not the Enterprise.
Corrected entry: OK, try and follow this - it's one of those time travel problems. The central premise of the episode is the paradox of the distortion being created in the future and getting bigger in the past - anti-time. Now, in the future, Picard gets to the location of the distortion and nothing is there - fine, makes sense so far. Unfortunately, when he returns to the same location (AFTER the first time), the distortion has appeared. If the paradox theory was run through to it's conclusion, the distortion would have been there when Picard first went to the location in the future, but not the second time.