When Eddie is in the hotel room with a scantily clad Carmen he locks the door before he rushes her, but he doesn't unlock the door when he leaves.
Eddie's reflection in the 3-ball is not reversed.
When Vince is letting Eddie know he dumped the match between the two he refers to his banked 5-ball but it's actually the 3-ball he banked and missed.
After playing Vincent, Eddie disassembles his cue stick twice.
After Moselle misses the 4 ball to the side pocket, Vincent shoots it into the corner pocket leaving the cue ball near the side pocket. When he lines up to shoot the 5 ball into the opposite corner pocket, the cue ball is in a direct line behind the five ball, not where it ended up after the four ball shot.
When Eddie is playing Amos (and still winning), he plays a kick shot combination with the 6 and the 9. The 3 ball is clearly still on the table, making Eddie's shot illegal for 9-ball.
When Vincent is playing Grady Seasons in the tournament, at one point, he shoots and misses an easy shot of the eight ball into the side pocket. While the camera moves with the shot, you see that the three ball is still on the table on the other side rail, indicating that he is aiming for balls out of order of nine-ball rules.
Presuming that the title refers to American paper currency, it is factually incorrect as all bills regardless of the denomination contain three "colors": white and black (which are actually shades) and green. If not, virtually all paper currency worldwide at that time contained multiple colors, so it should be correctly titled "The Colors of Monies".
It has been purported that the jump shots depicted in the film are illegal moves. Jump shots are legal in nine-ball.
Carmen says to Vincent "Nice guys finish last," Vincent replies "Oh, is that original or did you just make that up?", which means the same thing. However, Vincent is simply making fun of her for using such a clichéd phrase.
When Eddie (Paul Newman) walks into the main hall of the Resorts hotel past a crowd, a man in a white jacket turns to him and clearly says "Hi Paul".
At the start of the match in Atlantic City, there is the sound of rising applause from the audience at rack-breaking, but none of the audience members appear to actually applaud.
As the camera circles around Eddie and his girlfriend dancing, a camera is momentarily visible in the mirror on a pillar in the room.
Before the trio go into the pool hall that's turned into a used furniture store, a man opens the door at the front of the place, across the street from the characters at the car, and is facing them... then when the actors cross the street he goes back inside, having watched them.
During the pool montage just before Vincent plays Grady for the first time, he misses a shot on purpose and then stops the loose ball with his hand.