Freddy's shrine of Justice League souvenirs is easily best source of DC Easter eggs. He has a Batman action figure, a Superman baseball cap and mug, a batarang, and a bullet that hit Superman safely tucked in a plastic baggy. Most importantly, his shrine has an issue of Time Magazine published shortly after the attack on Metropolis by General Zod and a newspaper clipping about Batman and Superman, meaning that Shazam! takes place in the same timeline as previous films of the DCEU.