ST. LOUIS — The Green Bay Packers were on their way to the team hotel the day before the game when the cheesehead factor popped up again.

Coach Mike McCarthy joked it felt like walking down a street close to Lambeau Field. During warm-ups Sunday, fans began roaring, ‘‘Go, Pack, Go!’’ And Green Bay’s traveling wall of sound never let up during a 30-20 victory over St. Louis that was the Rams’ first home loss of the year.