Last season's NFC East champions were beaten 33-27 in the quarterback's first game back from knee surgery.
The 23-year-old told reporters: "I think we learned a lot about our team again. Every year is a new year. You've got to find out the identity of your team. I don't think we found that identity in that first game, but we did find out about the character of this team. It's similar to the one from last year.
"We're going to fight, never going to give up, and that's something you can be proud about. As far as execution-wise, we weren't very solid in execution all the first half, and then into the second half we started getting better. So hopefully we can ride that execution into this next game.
"I think it started in practice today. Guys came ready with the right mindset. It's not that we didn't have that last week. You just have a wakeup call sometimes and you've got to push even harder, and that's what we did."
The Redskins play the Green Bay Packers this weekend.