We just painted some walls with oil paint since it had oil previously a slightly darker color than what was on the walls and you can see some roller marks. Can I just roll on another coat of paint without trimming it first to cover? How can I guarantee that

Our wood entry door is being repainted dark red on the outside, and the inside is white. What color should the edges of the door be? What about the interior door frame? Can it be two colors, with the exterior part matching the outside trim and the interior part matching