Tampa Bay Rays manager Joe Maddon meant for Evan Longoria to DH while Ben Zobrist plays third base.
However, on the official sheet provided to the umpire before the game, Maddon listed both Zobrist and Longoria at third base.
That meant that Longoria wouldn't be allowed to DH and Rays pitcher Andy Sonnanstine would hit instead. Not only would Sonnanstine hit, but he had to bat third (where Longoria was intended to hit).
Although Sonnanstine recorded his first career extra-base hit during his second at-bat, I'm sure Maddon will be more careful next time.