Short answers, pulled from the story.
The National Football League selected Miami over New Orleans because the Saints lost money in their first season and faced public front office shakeups. A mix-up in the Tulane Stadium rental fee also dissuaded the league from choosing New Orleans. Miami hosted a sold-out Super Bowl II just four months earlier which made it a known commodity.
Joe Namath appeared at the Miami Touchdown Club three days before the game on the 12th of January 1969 to make his prediction. He stated directly to the audience that they would win the game and guaranteed victory against the Colts. This statement became famous after an article by Luther Evans of the Miami Herald published it.
Joe Namath completed 17 out of 28 passes for 206 yards during Super Bowl III. Matt Snell rushed for 121 yards on 30 carries with one touchdown while George Sauer caught eight passes for 133 yards. The Jets won the match with a final score of 16-7 in favor of New York.
NBC broadcast the game in the United States on the 12th of January 1969. Curt Gowdy handled play-by-play duties joined by color commentators Al DeRogatis and Kyle Rote. Jim Simpson reported from the sidelines while Pat Summerall conducted player interviews for the pregame show.
Forty-one point six six million people watched the game on television resulting in a rating of 36. The market share reached 70 percent despite blackout rules preventing live telecast within Miami itself. Astronauts Frank Borman, Jim Lovell, and William Anders led the Pledge of Allegiance after returning from their Moon mission just eighteen days prior.