When the Away Team beams to Sickbay with Picard at the beginning of the episode, Dr. Crusher asks what caused his injury and Worf responds that it was "a compressed teryon beam" from an alien weapon. However, when Picard is telling Q about his regrets he says that if he'd had a real heart he "wouldn't have died from a random energy surge 30 years later." Either Patrick Stewart was ad libbing and no one caught the contradiction, or the left hand didn't know what the right hand was doing on the writing team for that particular script. [Picard was hit by a Lenarian tetryon beam. If he didn't have the artificial heart, he would have lived. But since he had an artificial heart, a random energy surge in the heart killed him. http://memory-alpha.org/en/wiki/Tapestry.]

A transporter accident transforms Picard, Ro Laren, Guinan and Keiko O'Brien into small children who appear to be about 12 years old. Picard is 30-40 years older than Ro and Keiko. Guinan is over 500 years old. Why are they all returned to the same age? [Simple - their bodies have all been 'reset', as it were, to the same stage in their lives - apparently just before the onset of puberty. Therefore, they all appear to be the same age.]

After Geordie and Riker get Scotty out of the transporter, Riker introduces himself, including the ship's name. As soon as Scotty hears him say "Enterprise", he says "The Enterprise, I should have known, I'll bet Jim Kirk himself pulled the old girl out of mothballs to come looking for me". But Scotty was there when Kirk was "killed" by the Nexus in the beginning of Star Trek: Generations. That took place before this episode. Since Scotty was there when Kirk "died", how could be bet that it was Kirk who came looking for him? [This is a mistake, but more of a mistake on the movie Generations, then the series. This episode was written and aired (1992) before the movie Generations (1994). At the time the episode was written and aired, the events of the Generations had never happened (so what Scotty said could have been true, at that time).]

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. [They said when they returned to the anti-time distortion that they had to stop it before it started traveling back in time. They didn't see it before because it hadn't been created yet (remember this is all Q's working). Apparently, it had to reach a critcal mass before being able to travel back in time.]

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. [The three pulses did indeed come from the three Enterprises (past, present and future). The Pasteur was destroyed prior to its arrival at the anamoly and the crew was beamed aboard the future Enterprise by Admiral Riker. Also, Data didn't really say that all three pulses came from the Enterprise: he said it was "as if" they all were.]

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. [Data reported to the Enterprise-D as a Lt. Commander. Referring to him as Commander is an accepted practice.]

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. [When they arrive at "Vertiform City" and "New Vertiform City", they are actually a star and a pulsar: sources of vertiron particles. They said that there were pieces of many different holodeck programs running all at once. For this reason it is not truly a mistake.]

Dr. Crusher gets a load of Klingon venom in the face. Picard gets a drop of the same venom on the hand, and his hand looks terrible. But Crusher is all right at the end of the episode, and her face is looking better than ever. [While discussing what the venom did to doctor Crusher, they explicitly mention a need for reconstructive surgery. Considering that they can change Worf's forehead entirely in a matter of hours (see "Homeward") it would appear that reconstructive surgery can be done very easily and quickly in the 24th century, and, since it probably took quite a while for the entire crew to revert to their human selves, they apparently had time to fix her up. It would be important to get their CMO in good condition to help rehabilitate the rest of the crew.]

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. [1. If all life on Earth originated from the same pool of primordial ooze (see "All Good Things..."), then all life on Earth has shared ancestry. 2. Barclay was Patient Zero, so his de-evolution might be more advanced than the rest of the crew. 3. Barclay had Uridian flu (which is why he was injected with the synthetic T-cell that started the whole thing in the first place) which might also have affected how the mutations affected him.]

A nod to "Back to the Future III". As Ronin is talking to Beverly, we see a tombstone to his left, check out the name: "McFly" - someone in the set dept. had a sense of humour. [It's not like that's an uncommon name in Scotland, there are probably many McFlys in that cemetary or any in a Scottish community.]

Geordi says that Juliana has an aging program "just like Data," which contradicts several previous episodes when they've stated Data will never age and his appearance won't change. [Data does age, just look at the differences between the first season and the last, not the physical, but the emotional. Just because Juliana ages does not mean Data ages the same way, the programs can be like one another, but not exactly the same.]

Data claims that no one has ever described his violin playing as "beautiful," but Picard described it as such in "The Ensigns of Command." [However, after Captain Picard's comment in "The Ensigns of Command" Data corrected him by pointing out that "strictly speaking it is not MY performance" as he was imitating other musicians. Data never considered the Captain's statement a compliment of his playing because he didn't consider it his own playing at that time.]

In Juliana's memory chip, Soong talks about how he felt about her leaving. So how did he record his reaction to her leaving into her chip after she left him? [In the episode were Dr Soong created the emotions chip for Data, he contacted Data and Lore via a subspace signal. The signal activated their hidden programs that caused them to do anything to head for that planet. He could have sent a similar signal out to Juliana to add programming to that chip. Or, he could have done the same to her. Brought her back, added the information and sent her back.]

It's been established that both Deanna and Geordi can detect someone who is an android, but neither of them detect Juliana's true nature. [First: Deanna cannot detect androids. There are certain species that she cannot read at all. Data is (suppossed to be) the only sentient android in the Federation. Second: Geordi's visor acts like the sensors. The sensors and medical scans all say she is human. Soon made her that way.]