The early score of a game can be somewhat misleading. Sometimes a team can jump out to an early lead, but a closer inspection sees that they were operating on smoke and mirrors that cannot hold up for a full 60 minutes.
The prime example that always comes to my head is Oklahoma in their first CFB playoff against Clemson a few years back. Oklahoma opened the game driving down the entire field and scoring a touchdown. But a closer look showed that they were in trouble. If memory serves me correctly, they had to convert multiple third downs on that drive and absolutely could not run the ball.