The placement of Samantha's hands when she and Jay are talking to Mark about Thorfinn's bones change from shot to shot. She goes from having them by her sides to linked together, from her hand on her hip to together in front, from arms crossed to hands in front and hands at waist to below her waist during the conversation.
When Isaac is agreeing with Sam about Jay looking "hot" for firing the arrow, the sweat on the actor's face is clearly visible, something that a ghost could not logically have.