Same goes for me on both counts man.
Pretty sure the dude on the bench was the missing person's house that they went through that had all of the sexual art and dikk statues in it, where the other detective said, "If I die, go ahead and burn my shyt!"
So everyone kinda collision coursed I think? Colin's character was investigating the missing person who became the dead body, the dead guy maybe owed money to Vince Vaughn, or is somehow related money-wise, Taylor's character found the body on his part of the highway, and then McAdams I guess got called to the scene? Not sure if she's a homicide detective or not.