Factual error: In the parking lot of the race track, as the camera zooms out you can see a new Ford Thunderbird. This is impossible, as the scene takes place in 1979.
Lucky Number Slevin (2006)
1 factual error - chronological order
Directed by: Paul McGuigan
Starring: Bruce Willis, Morgan Freeman, Ben Kingsley, Lucy Liu, Josh Hartnett
Deliberate mistake: In the parking lot at the horse track, the old cars are so huge, they don't fit properly in the tiny modern spaces. They are hanging over the backs of the spaces so badly that the drivers would only have about two feet to try and get their enormous cars out of the spaces.
Slevin: How do you get to two men that can't be gotten to? You get them to come to you.
Question: Did Slevin actually suffer from Ataraxia? He lied about most things, and I couldn't be certain about that.
Answer: I don't think so. Everything that happens is a part of his plan, so rather than try to act scared, he just tells people he has a condition. In reality, he was very worried for Lindsay and pre-occupied with revenge.
Answer: No, like the rest of his "cover" (being mugged, being a friend of Nick's) he made it up. It was simply a way to plausibly explain why he was so calm through everything, when in fact he was calm because it was all part of his plan.
Answer: I doubt he suffered from ataraxia. His ability to be calm, "cool", and collected (under circumstances in which most people would be anxious, afraid, etc.) is more likely due to sociopathy. Sociopaths also tend to be chronic liars and manipulators and can be great impostors. Many have lost one or both parents early in life - Slevin's parents were murdered during his adolescence and he was subsequently reared by a career criminal. Slevin was also seeking vengeance for the murders that happened many years earlier, so having "peace of mind" or tranquility BEFORE getting the revenge seems highly unlikely.
Answer: I've considered 2 possibilities. One being the answer given about his cover, but I think he may have actually had it. When Goodcat is pointing a gun in his face as a child, he doesn't look scared in the least. The death of his parents "killed him" giving him the condition. Later proof is when he tells the Boss "You can only kill me once."