[2] After the German invasion of Poland in September 1939, Bytnar lived in occupied Warsaw and worked as a glazier and school tutor.

[8] On 4 April 1946, his close friend and fellow Szare Szeregi member who died on the same day during the war, Maciej Dawidowski (aka Alek), was buried in a common grave alongside Bytnar at the Powązki Military Cemetery.

[9] Bytnar is the main character in Stones for the Rampart, considered a classic of Polish literature for teenagers and young adults, by Aleksander Kamiński[10] and Rudy, Alek, Zośka by Barbara Wachowicz [pl].

[11] He is portrayed by Cezary Morawski in Jan Łomnicki's 1977 historical film Akcja pod Arsenałem telling the story behind Operation Arsenal.

[12] In a 2010 documentary film Oni szli Szarymi Szeregami directed by Mariusz Malec, the character of Bytnar is played by Bartłomiej Firlet.

[13] He served as inspiration for Dawid Podsiadło's 2014 single 4:30, the title of which alludes to the time when Bytnar was captured and arrested by Gestapo on 23 March 1943.

The song appears in Robert Gliński's 2014 war drama Stones for the Rampart, a film adaptation of Kamiński's book of the same title, in which the role of Bytnar is played by Tomasz Ziętek.