Jim Harbaugh, head coach of the San Francisco 49ers, disputes a pass-interference call against his team, as referees Derrick Rhone-Dunn (84) and Brad Hudspeth (53) confer in a preseason game against the Houston Texans in August. (Associated Press)

Jim Harbaugh, head coach of the San Francisco 49ers, disputes a pass-interference call against his team, as referees Derrick Rhone-Dunn (84) and Brad Hudspeth (53) confer in a preseason game against the Houston Texans in August. (Associated Press)