After retiring from football, Darden pursued careers as a sports agent, security provider and business consultant.

[11] ESPN chose Darden's November 21, 1971 interception in the rivalry game against Ohio State as one of the 100 Plays, performances and moments that define college football.

[13] By the end of Hayes' tirade, he had broken a yard marker, shredded a first-down indicator and earned two 15-yard unsportsmanlike penalties.

[19] Darden has explained that the 1977 Cleveland Browns did not respond to Gregg's coaching style, which contributed to his firing with one game remaining.

[20] When Cleveland played its season finale against the 1980 Bengals and their former head coach Gregg in the annual rivalry game, Darden used a forearm tackle to the face of Pat McInally.

[21] McInally was unconscious for about 10 minutes and left the field on a stretcher, but he returned in the second half to make a game-tying touchdown.

His rookie year, the 10–4 1972 Browns went to the 1972-73 NFL playoffs under head coach Nick Skorich, but lost in the first round to the Miami Dolphins 20–14.

[27] The 11–5 1980 Browns went to the 1980-81 NFL playoffs under head coach Sam Rutigliano, but lost in the first round to the Oakland Raiders 14–12.

[29] In 1985, government informant, David Rice, testified in Cuyahoga County Common Pleas Court that Darden was listed as a suspected dealer of cocaine in a document that he had been given by the Federal Bureau of Investigation while he was being wired with a hidden microphone.

[34] During Darden's career as an agent he represented an assortment of NFL and National Basketball Association players and prospects including Felix Wright and Chris Calloway.