SAN FRANCISCO -- The Pac-12 Conference said its instant replay crew made errors on two of three Cal touchdowns that were overturned during Saturday's Big Game against Stanford, commissioner Larry Scott announced Monday.

The Bears trailed 31-7 late in the third quarter when they apparently scored three touchdowns in a span of four plays. All three were overturned after video reviews.

"Through the Conference's officiating and game management review process, it was determined that there was not enough evidence through video replay for the instant replay crew to overturn the second and third touchdown calls made by the officials on the field," the Pac-12 said in a news release, noting that to reverse an on-field ruling, the replay official must be convinced beyond all doubt by indisputable video evidence.

The final two touchdowns that were overturned were Luke Rubenzer's 1-yard quarterback sneak and Jared Goff's 16-yard pass to Kenny Lawler. Cal settled for a field goal after the third TD was erased, and went on to lose 38-17.

Cal coach Sonny Dykes, asked about the calls immediately after the game, said, "I think it's shameful myself."

Dykes said Sunday he hadn't changed his mind about the decision after watching tape of the game but declined to comment on whether he'd filed a complaint with the Pac-12 office.

The Pac-12 said the replay crew would be held accountable through the conference's disciplinary process.