When Tommy recounts killing Max, he is shown pulling up next to the Lamborghini and shooting through the closed passenger window, shattering the glass. Shawn later steals the Lambo from police impound and delivers it to Tommy. Tommy then takes off in the car. As he is being chased by the police, the passenger window on the Lambo can be seen as closed and intact. (The police would have never repaired evidence - in this case, the vehicle - in an open murder case.)
when Lassiter hits Shawn in the face in the garage he spins and falls forward in the next shot Shawn is lying on his back
Shawn starts his story with "It was 1976 and a Georgia peanut farmer was the leader of the free world..." Jimmy Carter was elected in 1976 and would not be inaugurated until 1977. The leader of the free world in 1976 was Gerald Ford.
Gina tells Shawn "You can get the hell out of here... With a 'Z,'" then Shawn tells Gus "there's no 'Z' in 'asses.'" Since Gina never said the word 'asses,' one can assume that the script actually called for her to say "Get your asses out of here."