The first came on Michigan's first-half touchdown, as officials ruled Hart down on the 1-yard line after catching a screen pass from Henne.
But after the review, the officials correctly gave the Wolverines the touchdown.
At the end of the first half, Michigan appeared to take possession after defensive lineman LaMarr Woodley sacked Orton and forced a fumble.
After the review, officials ruled that Orton's knee had touched the ground. That allowed Orton to lead Purdue into field-goal range, but Michigan's Patrick Massey blocked Ben Jones's 44-yard attempt.
After last week's loss to Wisconsin, the Purdue coach Joe Tiller openly questioned the way that Big Ten officials called pass interference.
Whether his comments resonated or not, Purdue drew interference calls on Michigan's star cornerback, Marlin Jackson, on its first two drives.
The first one kept Purdue's scoring drive alive, coming on a third-and-8 play deep in Michigan territory. Five plays later, Jerod Void rushed in from 1-yard to give Purdue a 7-0 lead.
That was all the scoring Purdue could muster in the half, however.
No. 6 Wisconsin 24, Northwestern 12
In Madison, Wisconsin, Anthony Davis rushed for a pair of touchdowns and No. 6 Wisconsin beat Northwestern with star defensive end Erasmus James and his pass-rushing partner Jonathan Welsh on the sideline.
Both were out with ankle injuries but that didn't prevent the Badgers from going 8-0 for just the fourth time in the program's 115-year history.
The Badgers (5-0 Big Ten) turned to subs Joe Monty, Justin Ostrowski and Jamal Cooper to close off the edges and prevent Northwestern's mobile quarterback Brett Basanez from hurting them with his trademark rollouts and bootlegs.
Boston College 24,
No. 24 Notre Dame 23
In South Bend, Indiana, Paul Peterson threw a 30-yard touchdown pass to Tony Gonzalez with 54 seconds left to give Boston College its fourth straight victory over Notre Dame.
A 55-yard field goal attempt by Notre Dame kicker D.J. Fitzpatrick fell well short as time expired.
Harvard 39, Princeton 14
Harvard continued its unbeaten season with Clifton Dawson running for three touchdowns, and Ryan Fitzpatrick leading a potent passing attack, Harvard rolled to a 39-14 victory at Princeton Stadium. It was the ninth consecutive victory for Harvard against Princeton, as the Crimson (6-0, 3-0 Ivy League) remained tied for the league lead with Penn, which defeated Yale. The Quakers and the Crimson will play Nov. 13 at Penn.
Dawson, a star sophomore running back from Scarborough, Ontario, ran for 201 yards on 31 carries, while setting Harvard's single-season touchdown record. With 14 touchdowns this season, Dawson broke the record of 13 set by Chris Menick in 1997.
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