Roma were 2-1 down at half-time when a hailstorm interrupted play for 80 minutes, but Francesco Totti came off the bench to set up an Edin Dzeko equaliser and then convert a penalty with the last kick of the game.
“Anyone who says that was not a penalty is just trying to be contrary," Spalletti Sky Sport Italia.
“Dzeko is knocked down with a strike on the leg, it's a clear penalty! He sweeps the leg. Contact is when someone lets himself fall, but here Dzeko's leg was moved 20cm.
“Dzeko never dives and always tries to remain on his feet, for example as he did in Bergamo.
“Emiliano Viviano somehow managed to stop us scoring earlier, because he seemed like Lev Yashin out there."
He added: “I'd love to have four or five Tottis. He does these moments of magic constantly and unfortunately I didn't have the opportunity to use him earlier this season."