Short answers, pulled from the story.
The 1966 NFL season was the first in which the AFL-NFL World Championship Game was played, the contest later renamed the Super Bowl. The Green Bay Packers defeated the Kansas City Chiefs 35-10 on the 15th of January 1967 at the Los Angeles Memorial Coliseum. It is now recognized as the first season of the Super Bowl era.
The NFL and the American Football League signed their merger agreement on the 8th of June 1966. The two leagues kept separate schedules through 1969 and officially merged into one league with two conferences in 1970.
The expansion Atlanta Falcons held the first pick in the 1966 NFL draft and selected linebacker Tommy Nobis from the University of Texas. The draft was held on the 27th of November 1965 at the Summit Hotel in New York City.
The Washington Redskins defeated the New York Giants 72-41 in a week 12 game during the 1966 season, setting the record for the highest-scoring game in NFL history at that time.
The NFL sought a second franchise to host an annual Thanksgiving game alongside the Detroit Lions, and every team declined except Dallas. General Manager Tex Schramm accepted the offer in 1966, seeing it as a chance to build the Cowboys' popularity and establish a franchise tradition.
Pat Studstill of the Detroit Lions set a record for the most consecutive games with more than 125 receiving yards, achieving the feat five games in a row. That record was not tied until Calvin Johnson, several decades later. Studstill also became the third player in NFL history to complete a 99-yard pass play.