When the "Dante" clone is destroyed it leaves a flame outline on the ground which doesn't match the position of the body.
At 1:19:15, the countdown clock shows 4 minutes 11 seconds until the new clones start activating. Don continues fighting with Dante for 6 minutes 10 seconds before stopping the process.
At 20 minutes into the movie, when the newly created clone emerges from the tank filled with goo, after having apparently been fully submerged, the clone's hair is dry and clearly never been in contact with the goo.