Factual error: CDR Crighton has on his astronaut flight suit. He is wearing an American flag on his right upper arm. But the flag has the field of stars to his rear. It is a flag designed to be worn on the left arm, not the right.
Visible crew/equipment: When Pilot is closing all the doors, in one shot you can see a hand closing the door. (00:40:50)
Thank God It's Friday... Again - S1-E6
Other mistake: The planet population works in the fields, harvesting large brown biconal fruit. They seem to be heavy, as a bag containing about three of them is a burden to the person carrying it. When the leader of the planet shows one to Crighton, she picks one up with three fingers.
Other mistake: CDR Crighton is on an alien world, many light years away from Earth, but they seem to have identical—and I mean identical—Earth-type 55-gallon drums.
Visible crew/equipment: After Tahleen alters John's memory of himself as a young boy playing in the water, and then Aeryn tells John that he's the most bizarre creature she's ever met, when it cuts back to Moya as Rygel joins D'Argo, you can see the head and movement of one of Rygel's puppeteers as D'Argo and Rygel are talking.
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 ★