My memory (14 year-old, watching it on a black-and-white-TV) is that the game was very physical and hard-hitting. Common for that time period but even more so than usual. Two veteran O-Lines and D-Lines just pounding the crap out of each other. Jurgensen coming-in late scared the hell out of me but he threw multiple interceptions.
Problem with James Harris was, he never had a good playoff game. His best game was against the Vikings that year and that was checkered at best. He was not good against Washington and in 1975, when he got his chance against Dallas was awful before being pulled.
Now granted that was a combination of many things, but I remember him struggling against Washington as George Allen could still coach defense. Fortunately, Sonny Jurgensen served up the interception to Isiah Robertson after being hit by Merlin Olsen that clinched the Rams fist post season victory since 1951.