I don't know the scenes in The Hall of Justice were actually filmed inside Union Terminal, I had assumed they just did those one or two shots outside and then all the interiors were a set back at the studio. Did they change it much from how it usually looks?Those murals are based on the 1930s Winold Reiss industrial murals from the atrium of the Cincinnati Museum Center at Union Terminal, which was the inspiration for the original Hall of Justice in Super Friends (back when it was still a train station rather than a museum that moonlights as a train station) and which the movie used as a filming location. I assume they digitally altered the Reiss murals rather than tamper with museum pieces.
It's wild to see that a scene from this movie was filmed in a place I've actually been in numerous times in my life. I visited the Terminal a number of times in my youth, including once when my father hosted a radio broadcast from there, and in 1996 I worked there as a museum guide for the Star Trek Federation Science Exhibit, often taking my lunch break in the very atrium where they filmed. I haven't been there in quite a while, but I can see it from the overlook park near my apartment.
So I wonder if stuff with Peacemaker jumping universes is him going from the DCEU to the DCU or the DCU to another different universe?