[4] He has been praised by former Wisconsin coach Barry Alvarez as being one of the primary reasons why the Badgers were able to turn their program around and eventually win three Rose Bowls in the 1990s.

[citation needed] At Wisconsin[7] after a 1–10 season in 1990, Callahan helped pave the way for Terrell Fletcher to run for 446 yards in 1991.

The Raiders suffered a lopsided defeat in Super Bowl XXXVII losing 48–21 to the Tampa Bay Buccaneers coached by his former boss Jon Gruden.

Robbins went into a manic episode after not taking his medication, and spent most of the day before the game in Tijuana believing the Raiders had already won.

[12] Callahan is the third Raiders head coach to win an AFC West title and lead his team into the conference championship game in his first full season.

The Raiders offense also set many franchise records during this period, including fewest sacks allowed (28) in 2000, a mark that was broken the following year (27).

[13] According to Woodson, the Raiders locker room was almost in a state of mutiny against Callahan, a claim corroborated by veteran receiver Tim Brown and others.

On November 30, after a 22–8 loss to the Denver Broncos, Callahan said the Raiders must have been "the dumbest team in America in terms of playing the game."

Callahan was the last Raiders head coach to post a winning season until Jack Del Rio in 2016.

He had introduced the West Coast offense to a program that had traditionally relied on a strong option running attack.

Pederson was replaced on an interim basis by Nebraska's legendary former head coach, Tom Osborne.

On November 24, 2007, a day after a 65–51 loss to rival Colorado, Callahan arrived at the team's practice facility at 6:30 a.m.

Osborne announced during a press conference held at the school that despite Callahan's ouster,[22] he would still earn $3.1 million as part of his buyout.

[25] Callahan's 2005 recruiting class was rated as top-five by Rivals[26] and ESPN analyst Tom Lemming said they were "No.

Streaks such as 35 straight years in a bowl game and decades of consecutive wins against Kansas were lost in his 4-year tenure.

[28] Exacerbating Cornhusker fans' consternation with Bill Callahan's tenure at the university was his insistence that he had "done an excellent job in every area.

[30] In 2008, three of the offensive linemen (with Bill Callahan as their position coach) from the Jets were named to the Pro Bowl: Nick Mangold, Alan Faneca and D'Brickashaw Ferguson.

[citation needed] For the 2009 season, Peter King named Callahan the assistant coach of the year.

On June 4, 2013, Dallas owner Jerry Jones announced that Callahan would call plays on offense during the upcoming 2013 season, allowing head coach Jason Garrett to focus on game-management.

[34] Dallas let Callahan's contract as offensive line coach expire after the 2014–2015 season, allowing him to seek other opportunities.

[35] At the time, Callahan was considered among the best offensive line coaches in the NFL, and some considered him to be the leading reason behind the success of the Dallas Cowboys offensive line, which had 3 linemen (Tyron Smith, Zack Martin, and Travis Frederick) named to the 2014 All-Pro Team.

[37] On March 15, 2017, Washington promoted Callahan to assistant head coach in addition to his offensive line duties.

[41] On January 20, 2023, Callahan nixed an offensive coordinator interview he had had with the New York Jets and agreed to contract extension with the Browns.