The Super Bowl is the most popular game of the year, and the $10, $100 and $1,000 wagers from your Average Joe stacks up a lot quicker than action from sharp bettors.
Generally, books will be quicker to adjust a spread or total (in order to help balance action on either side) if wiseguys make a strong opinion on one particular bet. However, with two weeks to take wagers and knowing the betting public will hammer this game with both fists come Super Bowl weekend, sportsbooks are far less likely to react to early sharp money and move the Super Bowl odds.