When Dexter comes to his home where Lumen is staying, he shows her the pictures of Cole Harmon on his phone, the phone's model is listed as C0 but actually the phone that Dexter is using is Nokia N8. (at around 24:30 min)
When the men arrive at the swamp where the barrels are that need picking up, they are all in the pickup. After they finish loading the barrels, they are paid off and just walk away. Since Dexter established that this place is out in the middle of nowhere, they would need a ride back.