The quote audi, vide, tace translates to see, hear, be silent.
The sniper bullet POV shots were mini drone cameras flown at the actors, hitting them.
The scene with Brandon Beckett playing video games was the very first scene filmed on day 1 of production.
Bruno Diaz was Bruce Wayne's name in Latin America.
When Lady Death is revealed in the forest near Thomas Beckett's cabin, it was shot in the middle of the night. Cinematographer Stirling Bancroft had to light up the forest to match the daytime shots.