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49ers film review: Undisciplined defense leads to embarrassing performance

Most of the criticism levied at the San Francisco 49ers (3-5) has focused on the play of their offense. On Sunday, it was the defense that couldn’t get it done.

Sure, the offense had a couple of fumbles from George Kittle and Brandon Aiyuk that played a role in the loss, but the defense allowed 437 yards and 31 points to an Arizona team playing without its starting quarterback, two starting wide receivers, and lost a starting running back and offensive lineman early in the first quarter.

Let’s look back at some of the key defensive plays from Sunday’s game.