The situation: Tied at 7, the Packers face a 1st and goal at the 1 with 5:30 left in the first half.
The context: Vikings rookie quarterback had just thrown an interception on the previous drive to give Green Bay great field position. The Packers complied 53 yards on four plays in 2:19 to set up a scoring opportunity.
The result: Packers quarterback Aaron Rodgers connected with tight end Richard Rodgers for a one-yard touchdown to take the lead.
How it happened:

The Vikings were in their goal line package, countering a three-tight end, "I" formation look from the Packers. The Vikings had five down linemen, with nose tackle defensive tackles Tom Johnson and Shamar Stephen lined up at the three-technique spots outside the offensive guards.
The Packers sent rookie tight end Justin Perillo (circled in red) in motion to the left side of the formation. Safety Harrison Smith (circled in blue) followed Perillo, which my seem insignificant now but played a part in the result.

It was a play action pass, with Rodgers selling the run play with running back Eddie Lacy but instead rolled out to his right. The run, particularly with the down and distance and the formation, was the obviously call in this situation. But as Vikings head coach Mike Zimmer said last week, the Packers' playcalling can be unpredictable and difficult to stop. Note where Smith (circled in red) was positioned at this point of the play.

Smith and linebacker Gerald Hodges both covered Perillo (circled in yellow) as he cut across to his right following Rodgers. There was miscommunication between Hodges and Smith that caused this situation, which given how the play appeared to be designed, the assumption would be that Rodgers will throw the ball either in the middle or right portion of the end zone.