Principal photography took place from October to December 2022 in Los Angeles.
At 1h 8m while Knox is being interviewed by Detective Emily at the police station, he says "As far as you're concerned, I'm Schrodinger's murderer". He is referring to the experiment / theory that physicist Erwin Schrodinger created in the 1930's dealing with quantum mechanics, primarily quantum superposition. The experiment in itself is a paradox.
Titled "Assassin's Plan" in Australia, for some reason.
Fourth film where Al Pacino appeared with a Batman actor, this time with Michael Keaton. Pacino previously starred with Val Kilmer in Fogo Contra Fogo (1995), with Ben Affleck in Contato de Risco (2003) and with George Clooney in Treze Homens e um Novo Segredo (2007). Moreover, Pacino mentioned "Batman and Robin" while talking to Leonardo DiCaprio in the first minutes of Era Uma Vez em... Hollywood (2019).