Visible crew/equipment: At the start, while everyone's eating the buffet in the maintenance bay, after Pilot says, "Moya has not had peaceful rest since we entered the Tormented Space," the head of Rygel's puppeteer is visible at the left side of the screen.
Unrealized Reality (1) - S4-E11
Visible crew/equipment: When Crichton is about to take his last journey into the wormhole (in this episode at least) he pulls down the visor of his helmet. We can see four square and round white lights reflected that are not from the current scene.
Kansas (2) - S4-E12
Visible crew/equipment: After Scorpius tells Braca that the future of Peacekeeper survival depends on him, it cuts back to Earth and when the Sheriff says, "I got the warrant. Let's go search that house," as the car pulls away we can see a nice reflection of a crew member and the reflector screen.
Bringing Home the Beacon - S4-E16
Visible crew/equipment: After Rygel tells Noranti that she paid too much for having Moya's modulator fixed, and then begs her to cook for him, Aeryn and John come into view, and as they walk toward the camera we can see the moving shadows of the cameraman, camera, and boom mic at the right side of the screen.
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 ★