The league bylaws were changed to provide for playoffs in cases where division races are tied after the regular season, and rules for sudden-death overtimes in case a playoff game was tied after four quarters.
The defending league champion Chicago Bears and the Green Bay Packers finished the regular season tied in the Western Division, setting up the first divisional playoff game in league history. The Bears won 33–14 at Wrigley Field on December 14, then defeated the New York Giants 37–9 in the NFL championship game at Wrigley Field on December 21. The Bears, averaging 36 points per game, became the first team since the institution of the east–west championship in 1933 to repeat as champion.[2]
The total attendance for the league's 55 regular season games was 1,118,616. This represented an increase of 9% over the previous season's attendance.[2]
In the Eastern Division, the Redskins held a half-game after nine weeks of play: at 5–1–0, their only loss had been 17–10 to the 5–2-0 Giants, who had lost two games in a row. Washington, however, lost its next three games, while the Giants rebounded to win their next two games. On November 23, the 5–3 Redskins met the 7–2 Giants at the Polo Grounds, and the Giants' 20–13 win clinched the Division championship.
The Western Division race was one between the Bears and Packers. By November 2, when the teams met at Wrigley Field, the Bears were 5–0 and the Packers 6–1, in part because of the Bears' earlier 25–17 win at Green Bay. Green Bay's 16–14 win put them in the lead, and they finished the regular season at 10–1 on November 30 with a 22–17 comeback win at Washington. On the afternoon of December 7, 1941, on the day Japanese planes bombed Pearl Harbor, the Bears were losing to the Cardinals, 0–14, and trailed 24–20 in the fourth quarter before rallying for a 34–24 win. With both the Bears & packers finishing at 10–1, a playoff was set to determine who would go to, and host, the Championship Game. They met at Wrigley Field on December 14, with Chicago winning 33–14.
Pittsburgh Steelers: Walt Kiesling was replaced by Bert Bell, who had sold his ownership stake in the Eagles and then bought a share of the Steelers. Bell resigned as head coach after losing the first two games. Aldo Donelli did not fare any better, losing the next five before being fired. Kiesling then returned for the final four games.