The AFC West side failed to score in the first quarter of their 24-7 defeat to the Kansas City Chiefs earlier this month, but scored two touchdowns in the opening 15 minutes against the Pittsburgh Steelers last weekend.
The head coach told reporters: "We made a big point of it. Right now we're in the top five in the league as far as first-quarter scoring differential.
"We've been able to start fast and I think that's a critical aspect of playing good football, especially at home because the crowd gets in it, the crowd gets excited.
"But we've got to do a better job of finishing the game. We have to do a better job of staying focused and maintaining the same attitude, the same mindset, throughout the football game."
The Raiders face the Philadelphia Eagles on Sunday.