For this season only, the Seahawks played in the NFC West while the Buccaneers played in the AFC West. The Seahawks would return to the NFC West with the realignment prior to the 2002 season. The Buccaneers would set a record of futility, becoming the first NFL team to finish a season 0–14. The Buccaneers would go on to lose their first 26 games as a franchise before finally winning against the New Orleans Saints and St. Louis Cardinals to finish the 1977 season.
The New York Giants finally opened their new stadium Giants Stadium after spending 2 seasons at the Yale Bowl and one season at Shea Stadium.
A play clock is placed at each end of the stadium, visible to both players and fans to note the official time between the ready-for-play signal and the snap of the ball.
If the defensive team commits a foul during a failed extra point attempt, the try is replayed and the offensive team has the option to either have the distance penalty assessed on the next try or the ensuing kickoff.
If the defensive team commits a foul during a successful extra point attempt, the penalty will be assessed on the ensuing kickoff.
Players cannot grasp the facemask of an opponent. The penalty for an incidental grasp of the facemask is 5 yards. The penalty for twisting, turning, or pulling the facemask is 15 yards. A player can be ejected from the game if the foul is judged to be vicious and/or flagrant.
A defender is prohibited from running or diving into, or throwing his body against or on a ballcarrier who falls or slips to the ground untouched and makes no attempt to advance, before or after the ball is dead. This is sometimes called as the "Ben Davidson Rule" after the Raiders defender who almost seriously injured quarterback Len Dawson after the Chiefs passer fell to the ground and made no attempt to advance during a 1970 game.
The two expansion clubs, Tampa Bay and Seattle, were "swing" teams that didn't participate in regular conference play. Every other NFL team played a home-and-away series against the other members in its division, three interconference games, and the remainder of their 14 game schedule against other conference teams. As a member of the AFC in 1976, Tampa Bay played the other 13 members of the conference, while Seattle did the same in the NFC. The 14th game, played in Week Six, was Seattle's 13–10 win at Tampa.
Starting in 1970, and until 2002, there were three divisions (Eastern, Central and Western) in each conference. The winners of each division, and a fourth "wild card" team based on the best non-division winner, qualified for the playoffs. The tiebreaker rules were changed to start with head-to-head competition, followed by division records, common opponents' records, and conference play.