When Dr. Fate 'blinks' out of the torture chamber, his chair is left empty, with no sign of the shackles and straps which had been holding him.
When Aquaman and the Alpha Kaiju return to the water, there is no sign of the Atlantean fleet of subs that were spread all over NY harbour.
When Steve Trevor attacks Aquaman with the machine gun, the ejected shells are all depicted as being still fully intact round-nose bullets, not the empty shell casings they should be.
In this movie, Nazi Army (Heer) uses Kar 98 and MP 40 but even though Kar 98 is a bolt action rifle all guns work exactly the same like all of them are Submachine guns.
Steve Trevor identifies himself as a colonel in the United States Army, however, he wears the rank insignia of a second lieutenant throughout the movie.