When Dixie arrives in England in December of 1942, there is a P-51 Mustang on the ramp. This airplane was not in service in December 1942. Also this airplane has the black and white identification stripes not used until June 6, 1944.
The goof item below may give away important plot points.
At the military funeral of Dixie's husband, the folded flag she receives is folded wrongly. The trim with the grommets would never be shown. A properly folded flag ONLY shows the blue field with stars, and nothing else. Throughout the scene, you can see that several versions of the flag were used, but in each snippet, you can always see the trim, which should have been tucked under and inside the fold.