Continuity mistake: When Sy is following Nina and Jake after he put the picture of the husband cheating in with Jake's pictures, the cars pull over to the side of the road. If you watch when they pull over, you see that they pull over next to a down sloping hill that is nicely green with grass and a few sporadic trees. But when they show Sy's car in the rearview mirror, you see that they are now pulled next to a large up sloping hill that is covered in leaves, dirt, and a lot of trees. (00:53:40)
Answer: There is a line from the cop at the very beginning of the film in the interview room with Cy "We processed the roll of film we found in your bag Mr. Parish, they're not very pretty pictures. Also you left a camera in the hotel, we processed that roll as well. "As he talks about the second roll he indicates the folder containing the photos we see at the end. Therefore we can assume the "not very pretty photos" found on the roll of film in the bag are the lewd ones of the pretend sex acts. Whether he left the other ones behind as a cover or what he intended to do with the lewd ones we can but guess.