The 1925 NFL season was the sixth regular season of the National Football League. Five new teams entered the league: New York Giants, Detroit Panthers, Pottsville Maroons, Providence Steam Roller, and a new Canton Bulldogs team. The Kenosha Maroons and Minneapolis Marines folded, with Racine Legion mothballing.

Controversy surrounds who actually won the 1925 NFL Championship. Officially, the Chicago Cardinals are listed as the 1925 NFL champions because they finished with the best record; however, many Pottsville fans at the time claimed that the Maroons were the legitimate champions. The Maroons and the Cardinals were the top contenders for the title, with Pottsville winning a late-season meeting between them, 21–7. But the Maroons scheduled a game against a team of University of Notre Dame All-Stars in Philadelphia (and winning 9–7) on the same day that the Frankford Yellow Jackets were scheduled to play a game in the same city. Frankford protested, saying that it was violating their protected territory rights.

The National Football League has enjoyed success in selling out many of their venues from season ticket sales alone. Out of 32 teams in the league, 24 claim to have waiting lists from under 1,000 people to over 150,000. For some fans, this means a wait not just of years, but decades. This is due mostly to the NFL's short window of play; there are only eight regular-season home games, forcing the most devoted fans into a desperate and sometimes costly search for a limited number of events.

Since 1973, the waiting lists have also had the by-product of preventing any home games of certain teams from being blacked out on local television. Home games must be sold out within 72 hours of kickoff before a telecast is allowed, and the longest waiting lists have ensured every home game of the applicable teams being locally televised. Prior to 1973, home games could not be locally televised even if they were sold out. Four teams have had the benefit of not seeing any blackouts at all since 1972.

Personal Seat Licenses (PSLs) is a license which grants the holder the right to buy season tickets for a particular team. PSLs were first used in the NFL by the expansion Carolina Panthers in 1993 to help finance their new stadium. Since that time, several teams have used the mechanism to finance new stadium projects including the Chicago Bears remodel of Soldier Field and more recently the Dallas Cowboys. The New York Jets and the New York Giants used PSL programs to finance the construction of the New Meadowlands Stadium, now MetLife Stadium.

Edward Henry "Harry" Greb (June 6, 1894 – October 22, 1926) was an American professional boxer. He was the World Middleweight Champion from 1923 to 1926 and the American Light Heavyweight Champion from 1922 to 1923. He fought a recorded 303 times in his 13 year-career, against the best opposition the talent-rich 1910s & 20s could provide him, frequently squaring off against light heavyweights and even heavyweights. Widely considered one of the best fighters of all time, Greb was named the 7th greatest fighter of the past 80 years by The Ring Magazine, the 5th greatest fighter of all-time by historian Bert Sugar and ranked as the #1 middleweight and the #2 pound-for-pound fighter of all-time by the International Boxing Research Organization.

He had a highly aggressive, very fast, swarming style of fighting and buried his opponents under a blizzard of punches. Greb was also a master at dirty fighting and had no qualms about employing all manner of dubious tactics, such as spinning his opponent and using the heel and laces of his gloves. Greb often got as much as he gave and unbeknownst to the press continued to fight a number of matches even as he became blind in one eye, due to an injury suffered in an earlier match. The 'Pittsburgh Windmill' was also very durable, suffering only 2 TKO losses. The first was in his seventh bout and the second happened 3 years later when Greb broke the radius of his left arm. Greb finished the round but was unable to continue the fight. The second was in a bout where Greb was heavily outweighed.

John Earl Madden (born April 10, 1936) is a former American professional football player in the National Football League, a former Super Bowl-winning head coach with the Oakland Raiders in the American Football League and later the NFL, and a former color commentator for NFL telecasts. In 2006, he was inducted into the Pro Football Hall of Fame in recognition of his coaching career. He is also widely known for the long-running Madden NFL video game series he has endorsed and fronted since 1988.

Madden broadcast with Pat Summerall in the 1980s and 1990s, on CBS and later Fox. He was also the last color commentator for ABC's Monday Night Football before it moved to ESPN in 2006. His last regular role was as a commentator for NBC Sunday Night Football.

Madden has also written several books and has served as a commercial pitchman for various products and retailers. He retired from broadcasting on April 16, 2009 in order to spend more time with his family.

John Madden was born in Austin, Minnesota, to Earl Russell Madden and Mary Margaret (Flaherty) Madden. His father, an auto mechanic, moved the Madden family to Daly City, California, a suburb of San Francisco, when he was young. He attended middle school at Our Lady of Perpetual Help, and then Jefferson High School, graduating in 1954.