Immediately after arriving back from the action at Pearl, all Warren's scars that were acquired when he was shot down have disappeared and left no trace.
The time in which Pug is in Moscow with the Tudsburys is October 1941. Many Soviet soldiers are wearing shoulder boards on their uniforms. Stalin despised shoulder boards as being a Tsarist throwback. The Politburo pressured Stalin to reintroduce shoulder boards and he caved in and reintroduced them in 1943.
While taking a shower at the BOQ, Pug is wearing a pair of briefs.
One sign shows "Cavite Naval Station, Manila". The naval station was not located in Manila.