There were opportunities missed that the Bears will curse when they watch the game tape Monday.
Marshall dropped what could have been a 33-yard touchdown pass in the end zone on third down in the second quarter.
"I didn't make the play in the end zone," Marshall said. "I let the team down. I take full responsibility."
Devin Hester dropped a deep pass down the left sideline that he should have caught on another third down later in the quarter.
There were drops by Davis and Matt Forte on the Bears' final drive of the half.
When Cutler appeared to connect with Hester for a short pass that Hester turned into a 42-yard gain, Cutler was called for an illegal forward pass because he crossed the line of scrimmage. The play was nullified.
Texans linebacker Tim Dobbins also was flagged on the play for a hit to Cutler's head, which likely was the hit that injured Cutler.
"He took a lot of hits," Smith said. "More than he needed to take, more than we wanted him to take."
Whether it's from a better prepared Campbell or a healed Cutler, the Bears will need more from their quarterback.