Visible crew/equipment: When the Ghost of Christmas Present settles to the ground after floating down the stairs at Frank's brother's house, you get a brief glimpse of the wires attached to her back.
Visible crew/equipment: A stage light is reflected on Lou-Old boss' sunglasses.
Answer: It's a vision, not reality, so one could interpret it either way. I think it's more powerful if Calvin is seeing Frank, silently accusing him of being (at least partially) responsible for his (Calvin's) situation.