When Jess and Nathan are sitting on the couch, Jess fills 2 wine glasses. Nathan takes a little sip before they start to talk and when Jess puts her glass down on the table, Nathan's glass is now empty.
A character is stabbed from behind and the object goes through his laminated ID card, which was being worn on a lanyard around his neck. Due to the light weight of the card, the object would have pushed it away from the body, not penetrated it. The only way the damage shown could have taken place would be if he had been stabbed from the front.