Following Saturday night's preseason game against the Texans, 49ers coach Jim Harbaugh commented on the state of the NFL's officiating.

The league is using replacements while the permanent officials are engaged in a labor dispute.

Harbaugh initially said that "per instructions, I will not be commenting on the officiating", but could no longer keep quiet.

"Our guys, as they do a lot, they tightened up toward the red zone and held them to field goals. Big interference call in third quarter was some big yardage on that drive," Harbaugh said.

"I don't know. It's interesting. I don't have the pulse on this game. What was it exactly? Us? Them? Some crazy, wild calls. Were they accurate? Weren't they? We'll see. I have a headache (from yelling) though. I have a darned headache. A lot them (the calls) didn't seem like they were in the ballpark."