Though Phoebe, the American Congresswoman played by Jean Arthur is not married, the actress's real wedding ring is visible in many scenes especially closeups during the latter part of the film.
When the Americans are flying over Berlin, the scenery outside Phoebe's (Jean Arthur) window never changes.
Just after the movie begins, Phoebe Frost announces to the Army officers that she is the representative of Iowa's 9th Congressional District. The movie was shot, and set, after the end of WWII in 1945. Iowa's 9th District was eliminated by redistricting after the 1940 Census and ceased to exist after the representatives elected in 1942 - the first elections with the redrawn 8 districts - took office at the beginning of 1943. This error may have been intentional to avoid connecting her to a real postwar district.