Principal photography took place from October to December 2022 in Los Angeles.
Michael Keaton and Marcia Gay Harden previously starred together in Desperate Measures (1998).
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 Heat (1995), with Ben Affleck in Gigli (2003) and with George Clooney in Ocean's Thirteen (2007). Moreover, Pacino mentioned "Batman and Robin" while talking to Leonardo DiCaprio in the first minutes of Once Upon a Time... in Hollywood (2019).
In the film it is stated that John Knox has two PhD' s in English and U.S. History.
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