When a computer screen showed the date on May 6, 1985, there was a shot of the Challenger space shuttle exploding. The Challenger space shuttle ascended to heaven on January 28, 1986.
When Karl took off his glasses, the next lens, the glasses were put on again.
When Gordon spoke to Carl in Bard's apartment, the microphone for filming was reflected in the window.
During the meeting, Gordon's shoes changed when the camera was switched.
In the scene where Gordon and Bud met for the first time, when Bud left Gordon's office, his tie was still perfectly tied around his neck, and when Bud reached the door, his tie was messed up.
In the park at the end of the movie, the amount of water on Gordon's jacket changed when the shots were switched.
Bud was arrested for breaking a federal law, but in the movie, he walked into the New York State Supreme Court, and next door to it is the Federal Court.
When Lou Mannheim said to Bud that "money will make you do things you don't want to do", the microphone hidden under Mannheim's tie was exposed.
When Wideman was typing on the computer keyboard, when the lens was pulled back, he could see that the screen was black.
On the upper floor of the Whiteman Beach House, when Gordon was negotiating, the painting behind him changed as the scene changed.
When Bud was in a high-rise unit with a real estate agent, in the house, the sound of the street city, including the sound of the police siren, could be heard, but the floor was so high that there shouldn't be any sound of the city.
