The inbounds lines or hashmarks were moved closer to the center of the field, from 15 yards to 20 yards from the sidelines (from 70 feet apart to 40 feet apart). This remained the standard until 1972, when the hashmarks were moved in to the width of the goalposts, 18½ feet apart.
The player who extends his arms under the center must receive the snap or the offensive team will be penalized for a false start.
When a snap is muffed by the receiving player and then touches the ground, it is legally a fumble.
During an extra point attempt, the ball is spotted at the 2-yard line, but the offense may opt to have it be placed further from the goal line.
After a kicked punt crosses the line of scrimmage, the kicking team may recover the ball if it touches a member of the receiving team before they control the ball themselves.
In the Eastern Division, the Yanks were still unbeaten (2–0–1) as of Week Four; at their only Yankee Stadium game (October 14), they had a 13–10 lead until the Giants tied them 13–13. In Week Five, the Yanks' 38–14 loss to Green Bay, put them at 2–1–1, tied with 2–1–0 Washington, while in the Western race, the Rams reached 4–0–0 after a 41–21 win over the Bears. In Week Six, halfway through the ten-game season, Boston and Washington both won, putting them even at 3–1–1 and 3–1–0. The Rams' 28–14 loss to the Eagles, along with wins by the Lions and Packers, tied all teams at 4–1–0 in the west. In Week Seven, the a blocked extra point attempt gave Detroit a 10–9 win at Boston, keeping the Lions tied with the Rams (5–1–0) for the Western lead, while taking the 3–2–1 Yanks to a game behind the 4–1–0 Redskins. In Week Nine, the Rams took the lead in the Western after a 35–21 win over the Cards, while the Lions lost 35–14 to the Giants.
In Week Ten, the 7–1 Rams and the 6–2 Lions met in Detroit's Thanksgiving Day game. For the Lions it was a must-win game, but they lost 28–21; at 8–1–0, the Rams clinched the division. Days later, the 5–2 Eagles hosted the 6–1 Redskins, and the Eagles' 16–0 win tied the teams at 6–2–0 in the Eastern race. The next week, however, the Eagles lost to the Giants 28–21, while the Redskins beat the Steelers 24–0. Washington's 17–0 win over the Giants the next week clinched its division.