Gillian Of The Spirits - S2-E3
Revealing mistake: When the nude lady closes the door, look closely - you can see the edge of her pink bra right under the bar. (00:43:30)
Revealing mistake: The doorway inside Quinn's house on ice-world is lined with snow-covered icicles. Watch as Arturo walks through this doorway; he bumps into the icicles and you can see that it is just a bunch of cotton.
Revealing mistake: The dialogue says they are in San Francisco while they wait for someone to pick them up for day laboring. A few moments later, we see on the top of the building "Vancouver Ice and Cold Storage". They're clearly filming in Vancouver, not in San Francisco. (00:01:25)
Revelations - S4-E22
Revealing mistake: When the group is fleeing from the cops, there's a shot of the road as they're turning. The camera used has a crack, or piece of debris, on it at the top to the left. The black line doesn't move as the camera pans across the road.
Answer: The show's creator admitted that it was the wrong Arturo.