The 1979-1980 season was a little screwed up. The NHL added four teams from the collapsed World Hockey Association: Quebec Nordiques, Hartford Whalers, Edmonton Oilers and Winnipeg Jets. Apparently the league could not organize a season schedule based on conference and divisions quick enough. They sort of dropped the ball. Consequently, the playoff seeds were not based on conference. This is why two teams from the same conference met in the finals.
Here is a look at the top five teams in each conference at the end of the season. See how the Islanders and Flyers finished one and two in the Campbell Conference. Weird.
The Flyers set an NHL undefeated streak with 35 wins over a span of three months. This record set up a great chance for the Flyers to choke. It was a classic Philly choke job.