Watched the highlights show yesterday, and they highlighted a couple of massive missed chances when Scotland were on the French line. At the end of the first half when they were down to 14, Finn threw a short pass to Duhan who was tackled when it was a 5 v 2 out wide and the chance was lost. On the last play there was only one French defender to the right of where the play was, but no Scottish player ever looked that way and it would almost certainly have been a try.
Regardless of the tmo at the end, this was the worst decision of the game, the French try doesn't happen if the knock on is called here. The French player even stopped for a second expecting the whistle to go.