The instruments of the band during Kurt Stadel's performance don't fit with the music. e.g.: The first song doesn't contain any saxophones, even if they are shown playing. Also the dancers don't applause even if clapping is heard in the background, which would be too loud for the restaurant guests. And later when the drummer is leaving his instrument the drumbeat still can be heard.
Earlier Mr. Poldi mentioned that Miss Himmelreich's name is Carina. However when Rudi, who gets mistaken for Miss Himmelreich, improvises a first name, he says his first name is Marie and Poldi doesn't get confused by this.