L-R: Fred Haise, Jack Swigert and Jim Lovell. Although earth seems far way in the background, business attire suggests they were not in space at the time of this photograph.
Apollo 13 travelled further from earth than any other manned spacecraft. At one point, the crew of Jim Lovell, Jack Swigert, and Fred Haise reached a location 158 miles past the far side of the moon, or 248,655 miles from the surface of the earth. NASA has never revealed who was seated in the far seat when the craft was at its furthest point from the earth. It can be safely assumed that one member of the crew was a few inches further away from earth than the other two, and thus qualifies as furthest-ever away. John Swigert can be ruled out, however, because he sat in the middle of the 3-seat row. Thus, regardless of the orientation of the command module, his distance would never have exceeded the others.
It should be noted that seating in the command module was determined by NASA protocols, and not by the astronauts shouting “shotgun” prior to entering the rocket.