When Stanley lets Jake know that he's not leaving, Stanley puts his vest jacket over Jake's torso. In the next frame, the vest jacket is gone.
When Jake, Stanley, and Mimi go hunting and Jake says "I never heard you in a domestic squabble before", he then says "whoa". When the truck comes to a quick stop before the herd of dogs, you can clearly see all 3 stunt doubles sitting in the truck.