None of the main characters has a last name.
Except Efrat and Eviatar, all the other regular characters have the same first names as the actors who play them.
Hanna's repeated line "O-PEN!", whenever someone knocks or rings at her apartment door, became the trademark of the show.
The address of the building "Vitek 9" is fictional. The street name Vitek was named after the producer Risha Tirman's husband, who passed away several months before the production began. The number 9 refers to the number of the regular cast members.
The apartment building where the plot takes place is located in the corner of Rothschild Avenue and Hachashmonaim street, Tel Aviv.