The AFC South champions beat the Vikings 27-13 on Thursday, with rookie wide receiver DeAndre Hopkins among those scoring touchdowns.
The Texans head coach told reporters: "It was encouraging. We had a lot of young players do good stuff. When you start defensively with Earl Mitchell and how positive it was. [Terrell] McClain, we're looking for a backup nose to Earl. Somebody that can be a rotational player for us and help and we thought he did some really good things.
"We have a lot of ability out there. DeAndre [Hopkins] showed, like I said, ended up making a play just like he's being making in the whole camp. There are so many things he's going to get better from watching this tape.
"Obviously, things are never as good as you think they are when you go back and watch the film. There were plenty of mistakes and we can get better."
The Texans play the Miami Dolphins next Saturday.