The original teaser trailer featured Eddie Ifft and Marin Hinkle as a couple discussing the movie after a date, and did not feature any footage whatsoever from the movie.
Vann is talking to Doug while Doug is putting his pants on. Doug is sitting with his pants just past his underwear, when the camera moves to Vann. When we come back to Doug, you cannot see his pants at all, just his underwear.
Ferrin purchases a pint of Jack Daniels and has it when she and Vann ride off to the beach. Later she tosses it to him and it became a fifth of Jack Daniels.
Vann Siegert: Some people die in less than a minute, others it takes ten. I guess it's what they call metabolic. If it wasn't closed, I'd go to the library and get clear on this.