The Lions shot themselves in the foot on this one.
Their defense played great in the first half. The Pack got their td after a turnover gave them the ball in the red zone. The Lions had over 200 yards in the first half, the Packers less than 100. Penalties, a missed fg, some poor throws by Stafford, or the Lions might have been able to take a lead into halftime and this would have been a different game.