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This was the final season that all AFL on-field officials wore vertically striped red and white uniforms. The next year all officials would wear uniforms mirroring those of their NFL counterparts.
Division races
The AFL's nine teams, grouped into two divisions (5 teams in the Eastern Division), faced each other at least once, and each team would play six others twice. Though the New York Jets and the Houston Oilers were both in the Eastern Division, they met only once that season, on October 15. The best team in the Eastern Division would play against the best in the Western Division in a championship game. If there was a tie in the standings at the top of either division, a one-game playoff would be held to determine the division winner.
Denver Broncos: Lou Saban became the team's new head coach. Mac Speedie resigned after starting the 1966 season 0–2, and then line coach Ray Malavasi served as interim for the remaining 12 games.