Invisibility


 * Joe "Are you invisible?"
 * Sam "No. We're wings and blood like you Joe. Don't overthink it big guy."
 * Joe "Hey, believe me, most things in life I don't overthink. This time though, I have put some thought into this."

When visiting Michelle's parents, the pixies are at moments clearly visible grabbing Joe's extremities, but when it cuts to the point of view of the others, it looks like Joe is on his own and they ask if he is playing charades.

This indicates that they are able to be invisible to humans other than Joe. He asks Sam and he denies this, but Joe remains skeptical.