The invitation shown from the "Associated Friends of Soviet Russia" requests the "honor" of the recipient's company, and later a newspaper headline reads, "Rumor M.P. To Be Arrested In Spy Probe". As the film takes place in Canada, where British spellings are used, the words should have been spelled "honour" and "rumour". Similarly, a headline in the "The Ottawa Globe" is "R.A.F. Blasts Cologne". British English treats an organization as plural, so it should have been "R.A.F. Blast Cologne".
At the start the film states "All exterior scenes were photographed in Canada in the original locals." They must have all been filmed at the same time (February?). This becomes evident as just after the narrator states "Shortly after Germany collapsed..." outdoor scenes showed Ottawa with snow covering everything from lawns to signs to streets. But Germany surrendered May 7, 1945, and Ottawa is NOT so far north as to still be snowbound in early May. Canada has Spring and in May Ottawa's streets are snow free with trees budding and flowers in bloom.
The Russian characters speak colloquial English with no accent.
The story begins in 1943, but June Havoc is already wearing the latest "new look" fashions which were not introduced until 1948.