If South Africa had been awarded a penalty, they would have had a chance to kick for victory from the tightest of angles.
Jones said: "You can get cited for something you did at a party when you were 15, anything could happen".
The clock had ticked past the 80-minute mark at Twickenham with England desperately trying to keep the Springboks at bay when Farrell smashed into replacement Andre Esterhuizen, knocking him back and dislodging the ball.
"I've got no idea what can happen", the Australian added.
World Rugby confirmed there were no citings from England's 12-11 victory over the Springboks at Twickenham, with Farrell's challenge on Andre Esterhuizen not meeting the red-card threshold.
'It's like everything - when you're selecting a national team, there's a whole lot of good players that don't quite make it.
After looking at the replay, officials ruled that Farrell had made enough of an effort to wrap an arm round his opponent to make the tackle legal - leaving the England No.10 punching the air in delight. We've lost a few games, we played tough and we won.
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"As soon as anyone goes to the big screen you are (nervous)", Farrell told reporters.
'I just think the game is getting more intense.
Ex-international referee Jonathan Kaplan, from South Africa, said Gardner got it wrong, opining that Farrell's "arm wrapping around is an afterthought".
Jones hinted at frustration with the penalties conceded, though, and Maro Itoje was sin-binned early on.
England have not played the 2011 and 2015 world champions for four years.
Asked if such moves are generally respected within the sport, Foster said: 'I don't know; I think everyone's going to have mixed opinions on that.
"They want the game to be an athletic contest".