Another post suggests that the film erred by Tom shifting his car into reverse then drives away forward at the end of the film. The car is a manual transmission Ford with a column-shifted 3 spd manual transmission with an unsynchronized first gear. A quirk of that style transmission is that at a standing stop, getting the transmission into 1st gear when the engine is running is easiest if the operator first abruptly lifts the shift lever from neutral to place the transmission into second gear, then back down into first. This prevents clash (grinding) of the unsynchronized first gear. Drivers of the era, including Gregory Peck, would have been well familiar with this technique.
The opening shot of a New Haven Railroad train supposedly shows Tom's train home, leaving New York in the evening. But then the sunlight should be on its left side (as it is in the interior shot following).
Tom and his unit are transferred from Italy in July 1945 (according to what he tells Betty later) to the Pacific. They then participate in a major airborne amphibious assault. Problem: There were no major actions in the Pacific at that time. The last one, the Battle of Okinawa, ended in June. It had no airborne element.
In the film, Tom Rath and his paratroopers belong to the 509th Parachute Infantry Battalion, which actually saw combat in Italy during World War II. In reality (unlike the film), the 509th did not get sent to the Pacific Theater to fight the Japanese (or make a combat jump there) after the battalion's tour in Italy was over.
Near the end of the movie, when Betsy's at the police station, Tom asks Betsy over the phone if there are any charges against her. The policeman answers, "Just bring the license" before Betsy can ask him if there are any charges.