Auburn (6-2, 4-1) used two timeouts to force a punt and took over at its 31 with 20 seconds left in the half. Trying for a big play, Daniel Cobb retreated and then turned to his left to attempt a screen pass. Cobb overthrew everybody except Tony Bua, who made the interception and stepped out of bounds at the 16 on his way to the end zone.
On first down, Clark threw left for Smith, who caught the ball and got a foot down before falling on his back in the end zone.
Auburn closed to 21-17 when Carnell Williams took a pitch heading left, split defenders, and ran by Ken Hamlin on a 55-yard dash.
Moments later, Arkansas got a break when Marvin Jackson fumbled a punt and his teammates recovered at the Razorbacks 28. A personal-foul penalty helped Arkansas reach midfield and then Jones faked a handoff to the right and started left. He pulled loose from linebacker Mayo Sowell's attempt at a shoetop tackle and turned on the speed for a 37-yard gain that set up Fred Talley's 12-yard touchdown run in the opening seconds of the fourth quarter.
Williams ran through most of the Razorbacks for 38 yards to the Arkansas 26, but Hamlin caused Casinious Moore to fumble and Corey Harris returned the recovery 46 yards.
A personal-foul penalty and an unsportsmanlike-conduct penalty preceded Jones' perfect read on an option that resulted in his 32-yard touchdown run - a play that made it 35-17 and sent Arkansas coach Houston Nutt scurrying down the sidelines to hug many members of the defensive unit seated in metal folding chairs.
Auburn had an excellent chance to establish momentum early in the third quarter, but Carter - running in the open - dropped the ball after a 37-yard gain. Then, Cobb missed a wide-open Carter and Damon Duval - strong-legged and reliable - put too much hook on a 49-yard field-goal attempt.
After Brandon Johnson's 18-yard sack of Clark and a 32-yard punt, Auburn started from midfield. But one first down later, the Tigers punted.
Arkansas was leading 7-3 and facing third-and-13 when Jones replaced Clark, who was 8-of-9 for 105 yards at that point. From the shotgun, Jones rolled left behind a moving pocket, stopped, took three steps upfield and then found Smith running behind safety Stanford Simmons.
The 63-yard drive started after Duval was barely wide on a 54-yard field-goal attempt.
Clark kept the drive alive with a 9-yard pass to Richard Smith on third-and-8. He also had a 16-yard completion to Gerald Howard and Cedric Cobbs contributed an 18-yard gain on a draw play.
Auburn's 12-play response included runs of 14, 6, 7, and 21 yards by freshman Williams and two third-down completions by Cobb. From the 8, Cobb threw to Tim Carter, who stretched to get the ball across the goal and fumbled. Bua had his hand on the ball for a moment, but lost control and Carter recovered in the end zone.