Bob Costas said he made a “mistake,” violating his own rule of not trying to compress a nuanced topic into small bit of air time, with his controversial halftime commentary Sunday night on the murder-suicide committed by Jovan Belcher of the Kansas City Chiefs the day before. “My mistake is I left it open for too much miscommunication,” Costas said in a lengthy interview on “The Dan Patrick Show.” The 90-second weekly spot, he said, doesn’t offer enough time in which to adequately discuss the issue of “the football culture, the gun culture, domestic violence.”