HOUSTON -- Here are three things you need to know about the 49ers’ 16-13 loss to the Houston Texans on Saturday night in Week 2 of the exhibition season...

Interior D-line has Depth

The 49ers still don’t really know from where their outside pass rush is going to come, but the interior of the defensive line looks to be in good shape. Veteran Earl Mitchell is a solid presence at nose tackle. And DeForest Buckner could become one of the league’s better defensive tackles.

Behind Mitchell and Buckner are a couple of young players who have put together strong training camps. Sheldon Day and D.J. Jones continued their impressive play on Saturday with strong showings against the Texans.

Day recorded five tackles and forced a fumble, while Jones came up with three tackles and a forced fumble, too. Day is in his first summer with the 49ers after the club claimed him off waivers from the Jacksonville Jaguars last season.

Jones, meanwhile, has made tremendous strides since his rookie season. He said he lost 20 pounds from the end of last season when he regularly found himself on the inactive list for games.

“I feel like it’s been a big turnaround, the way I changed my body in the offseason,” Jones said. “Toward the end of the season when I wasn’t playing, the way I practiced, it got me prepared for this season.”

In the Right Slot

Second-year player Trent Taylor missed most of the offseason program after undergoing surgery to remove bone spurs in his lower back. He has slowly been working back into form during training camp.

 

Taylor clearly made a lot of progress during this week in Houston. He was Jimmy Garoppolo’s favorite target during the two days of practices against the Texans. And Garoppolo looked for Taylor again on Saturday with a 2-yard touchdown pass to cap the 49ers’ first drive of the game.

“I’m starting to get stronger and get my legs back under me,” Taylor said. “It’s always good to feel improvement as you work. I still have a little ways to go, but it definitely felt great being out there tonight and getting my first catch as a TD.”

Taylor, the team’s primary slot receiver, had only two catches for 7 yards. But his other reception was a 5-yard catch to extend the 49ers' second drive on a third-and-4 play.

Penalties Galore

The 49ers certainly have a lot of room for improvement, especially when it comes to avoiding flags. Kyle Shanahan’s team was called for 15 penalties, totaling 140 yards.

What always gets to Shanahan most are the pre-snap penalties. Joe Staley (false start), Kendrick Bourne (illegal formation), Darrell Williams (false start) and Cedric Thornton (neutral zone infraction) were called for those kinds of infractions.

The worst sequence of penalties, however, went to veteran center Weston Richburg. He was guilty of a rare double-penalty on the first play of the second quarter when he was flagged for holding, then another 15 yards for his ensuing dialogue with the official.

Two of the penalties might have been excusable, though. Raheem Mostert and Jeremiah Attaochu were called for strict interpretations of the NFL’s new rule on lowering the helmet to initiate contact.