The Willamette Pass mentioned truly does exist except it's in Oregon, not Washington. At 6,683 feet in elevation it's part of a forested recreational area that includes a lake and sits outside of Eugene, Oregon.
After The Leap Home: Part 2 (Vietnam) - April 7, 1970 (1990) and Nowhere to Run - August 10, 1968 (1992), this is the third episode in which Sam leaps into a Vietnam War veteran.
In the original history, Roy Brown died of a seizure on November 7, 1972.
This episode takes place in Vietnam on August 6, 1968 and Washington from November 6 to November 7, 1972.