Relativity - S3-E10
Visible crew/equipment: When Stark and Aeryn are back aboard Talyn with Xhalax, who is tied up, when Stark says, "As far as I can tell, Talyn's systems are almost back to normal," we can see the puppeteer's face (wearing a weird black mask) and hands under Rygel's hoverchair.
...Different Destinations - S3-E5
Other mistake: While in the past on the Jocacean Memorial Planet, after Dacon is sent up on the wall by his commander, when the Venek Horde are coming over the wall Aeryn pulls one down and throws him to the ground, and we can see one of the armor pieces lying on the ground with the actor name "Dacon" written on the inside in English.
...Different Destinations - S3-E5
Trivia: While they're waiting for the Venek Horde to attack again, when John's chained to the statue Scorpius/Harvey's playing the harmonica with his feet up on John's lap. Notice that both soles of Scorpius/Harvey's red boots have the name "Andy" written on them. In "Toy Story" Woody's boot has "Andy" written on its sole, and here in John's mind it's to signify John's ownership of the neural clone.
Visible crew/equipment: When Stark and Sierjna go to Talyn's rudimentary pilot's den, notice that Stark's vest has suddenly developed five randomly placed grommet openings, which will be where Talyn's wiring will attach when Talyn bonds with Stark. And when Stark-Pilot says, "Talyn you will turn away, you must turn away," there's boom movement at the right and left of the screen. Also, later when Stark-Pilot flies Talyn closer to the sun to rescue Sierjna, and once she reappears, there's a shot from behind Stark-Pilot and we can see the long rod (not Talyn's wiring) that's behind his right leg attached to his pants, which is part of the support equipment to have Stark-Pilot hover.
Chosen answer: It's never explained. John mentions a theory that his less technologically developed craft simply interferes with the wormhole less than the "superior" Vipers, but they never make a concrete determination on that point. But we also have to take into account the fact that Moya traverses wormholes with no ill effect as well.
Garlonuss ★