[7] Also during his time in office, he appointed former state government members Eberhard Diepgen, Heidi Knake-Werner, Ingrid Stahmer and Wolfgang Wieland as advisors on the city's migration policies in 2014.

[12] Ahead of the Christian Democrats' leadership election in 2022, Czaja publicly endorsed Friedrich Merz to succeed Laschet as the party's chair and joined his campaign team.

[16] For the 2021 national elections, he joined Spahn in endorsing Armin Laschet as the Christian Democrats' joint candidate to succeed Chancellor Angela Merkel.

[17] Also in 2021, Czaja publicly criticized the chairman of the CDU in Berlin, Kai Wegner, as being too right-wing, arguing that he was "closer to Hans-Georg Maaßen than Angela Merkel and Armin Laschet.

[20] In 1997, a court ordered Czaja – who was 21 years old at the time – to pay a fine of 2,000 Deutsche Mark for desertion after he had twice failed to report for duty in the German Armed Forces.