When Sammy is hit with the throwing knife it's stuck just below his heart on the left side of his chest. But in the next cut scene when Malone grabs Sammy in a close up scene the knife is stuck in the right side of his chest.
When Malone takes Frankie the Crooner for a joy ride in the boot of his car - towards the ending of all the spins and donuts where dust goes everywhere - you can clearly see a white Jeep driving off in front of Malone's car for about 15 frames.