Goofs

The main premise of the show is that the protagonists don't know for sure that Oswald was the lone gunman hence the long stakeout. However, given that going back 'resets' everything the quickest way to ascertain Oswald's involvement would be to shoot Oswald, go back to 2016 and see if Kennedy survived. If he was still assassinated then going back again would 'undo' Oswald's unnecessary death and Jake could concentrate on finding the real assassin.But Oswald only returns to the US in 62. So it will always take at least 2 years to complete the test. See more