American football rules
Super Bowl LI was the first Super Bowl to go into overtime with a 28-all tie between the Atlanta Falcons and New England Patriots, which the Patriots eventually won with James White scoring a touchdown on the Patriots' first drive.
2007 New England Patriots season
The New England Patriots of 2007 are the only NFL team of the modern (Super Bowl) era to have an undefeated record during the regular season and not win the Super Bowl.