Three referees--Walt Fitzgerald, Bob Finley and George Rennix--retired following the 1970 season. Bob Frederic, Dick Jorgensen and Fred Wyant were promoted to fill those vacancies. Rich Eichhorst, a back judge in 1970, resigned to concentrate on officiating college basketball; he was replaced by Don Orr, who officiated in the league through 1995.
Major rule changes
Teams will not be charged a time out for an injured player unless the injury occurs inside the last two minutes of a half or overtime (since 1974).
Missed field goal attempts can be run back.
Division races
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, record against common opponents, and records in conference play. More tiebreakers were provided in 1971 because, in 1970, reversing just one game’s outcome would have led to a coin toss between Dallas and Detroit for the NFC wild card berth.
Note: Prior to the 1975 season, the home teams in the playoffs were decided based on a yearly rotation of division winners. Had the playoffs been seeded, the divisional round matchups would have been #3 Cleveland at #2 Miami and #4 wild card Baltimore at #1 Kansas City in the AFC; #4 wild card Washington at #1 Minnesota and #3 San Francisco at #2 Dallas in the NFC.
New England Patriots: John Mazur began his first full season as Patriots head coach. He replaced Clive Rush after seven games into the 1970 season due to medical reasons.
San Diego Chargers: Sid Gillman returned to the field after sitting out half of the 1969 season and all of the 1970 season due to poor health.
Washington Redskins: George Allen was named as Washington's head coach. Vince Lombardi was diagnosed with terminal cancer in late June before the 1970 season, dying on September 3. Offensive line coach Bill Austin served as Washington's head coach for 1970.
In-season
Denver Broncos: Lou Saban left the team after a 2–6–1 start. Offensive line coach Jerry Smith served as interim for the remaining five games.
11 teams played their home games on artificial turf in 1971. This was up from 7 teams in the NFL in 1970. The teams were: Chicago, Cincinnati, Dallas, Houston, Miami, New England, New Orleans, Philadelphia, Pittsburgh, St. Louis and San Francisco.
Uniform changes
The Atlanta Falcons switched their primary jerseys from black to red
The Chicago Bears adopted a second white jersey with block numbers
The Oakland Raiders switched from silver to black numbers on their white jerseys
