[4] On matchday 3, Union Berlin gained their first ever Bundesliga win, in a shock 3–1 home victory against UEFA Champions League outfit Borussia Dortmund.

[5] During the first five matchdays, International Centre for Sports Studies research concluded that Union Berlin had the highest average height across the top 31 European first divisions.

[10] On matchday 19, Union Berlin recorded their first win after the winter break, following a 3–1 loss to RB Leipzig a week prior, after defeating Augsburg 2–0, with Neven Subotić scoring his first goal for the club.

[11] On 1 March 2020, Sebastian Andersson scored his tenth Bundesliga goal of the season in a 2–2 home draw against VfL Wolfsburg, ending an eight game long drought.

[12] The game was suspended for over ten minutes during the first half, after protests from Union Berlin's fans against TSG 1899 Hoffenheim's owner Dietmar Hopp in solidarity with Bayern Munich, Borussia Dortmund and 1.

[14] Ahead of matchday 26, the Bundesliga was suspended, owing to the COVID-19 pandemic in Germany, with the Deutsche Fußball Liga recommending a suspension until 2 April 2020.

[15] The second Berlin derby of the season, originally scheduled for 21 March 2020, was due to be played behind closed doors following advice from the Bundesministerium für Gesundheit,[16] but was later postponed following the Bundesliga's suspension until 2 April.

[17] On 17 May 2020, after six Bundesliga matchday 26 games were played a day prior, Union Berlin lost 2–0 at home to Bayern Munich behind closed doors.