An angry Brady sprinted over to two officials to argue the call as they walked off the field.
"He was kind of weaving in and out of there. I didn't really want to throw it over his head and out of bounds, so I was a little indecisive," Brady said. "It wasn't a great throw. No excuses. Should have been a better throw."
Brady was 29 of 40 for 296 yards and one touchdown. Newton completed 19 of 28 passes for 209 yards and three touchdowns. He also ran seven times for 62 yards in what will go down as one of his best games a pro.
After the game, Rivera called it a "gutsy effort."
"It wasn't our best defensive effort, but it was one of our better offensive efforts," Rivera said. "It was good for our guys to win a game like this."
Carolina's win came eight days after a 10-9 victory over reigning NFC champion San Francisco.
Newton gave Carolina a 17-10 lead in the third quarter on an 81-yard touchdown drive that took more than 8 minutes off the clock and featured a scramble in which the third-year quarterback avoided four tacklers and turned a potential 20-yard sack into a 14-yard gain and a first down.
"Cam did the things he needed to do to put us in position to win the football game," Rivera said. "It has a lot to do with his maturity that we have talked about."
Copyright 2013 by The Associated Press