Czar Boris III, named in the movie as "King of Bulgaria" arrived in Berlin in August 1943. However Albers is seen filming The Adventures of Baron Munchausen (1943), which premiered in March 1943.
The closing credits say that Hans Albers made 15 more movies in the 1950s. In real life it was 17, which were also released in the 1950s. His last movie Kein Engel ist so rein (1960) was also partly filmed in 1959.
When talking about Erich Blydt ("nice guy ... Norvegian and a bachelor") Hans Albers said, that he is an antique dealer. In real life Erich Blydt was an architect. However it is true that he also owned an art shop in Berlin Kurfürstendamm.
When mentioning Albers' career Hansi Burg mentioned his performance in Liliom at Volksbühne Berlin and then scenes from Der Greifer (1930) was shown. The play "Liliom" premiered in Berlin in 1931 while the movie "Der Greifer" came out in 1930.
In one scene Hans Albers should give up his room for the King of Bulgaria. The scene is set in the early 1940s. While Bulgaria's English name was "Kingdom of Bulgaria", during that time, until 1946, Bulgaria was ruled by Czars, not by Kings. So the appropriate address in this case would have been "Czar of Bulgaria", Boris III, in that moment.
Hansi Burg said, that she and Hans Albers met as customers in the butchery of Albers' father in Hamburg. In real life they met during acting performances in Trianon-Theater in Berlin.