Revealing: When Gene's bodyguard (the one with the moustache) shoots Slasher and Duke, just before Slasher is shot the bullet hole effect is visible on her forehead (sightly concealed by make-up) just before the actual 'shot'.
Quotes
The Duke: Don't you fucking talk to me like I'm some kind of mug. Don't you fucking talk to me like that.
XXXX: Duke, don't take this personally. It's business. Now, you want to know how much these pills are worth?
The Duke: Yes. Fucking. Please.
XXXX: Now just because you pay a fiver a pop down the local cattle market, don't, for fuck's sake, think these pills are worth millions. They're not. We've got to find someone to buy these pills and they've got to split them into parcels, of say 100,000. They've got to find these people. It's hard work.
The Duke: Oh, you'd give a fucking aspirin a headache pal.
Mistakes
SPOILER: When XXXX gets shot at the end of the movie, a simulated blood packet is visible being shot at him, not a bullet. See more...
Trivia
Near the end of the film where XXXX, Morty, Trever, Gene and Clarkey are sitting around the table and they lift their glass' to him there is a 'layered cake' on the table. Cleverly placed. See more...
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Layer Cake mistakes
Factual error: When the pills are being recovered in the mock police raid, we see, several times, an observer watching through binoculars. We see his eye enlarged, despite our looking the wrong way down the lens.
Continuity: When XXXX is awakened by Dragan's phone call, there is a gun lying on his pillow. In the overhead shot the gun is pointing in one direction; in subsequent shots it is pointing the other way.
Layer Cake trivia
In the final scene were XXXX is in the Park club dining with Trever, Morty, Gene, and Clarkey there is a shot outside the room looking in where XXXX is standing and the others are raising their glasses to him. This is similar to the final scene in 'The Godfather'. This is said during the director's commentary.
Near the end of the film where XXXX, Morty, Trever, Gene and Clarkey are sitting around the table and they lift their glass' to him there is a 'layered cake' on the table. Cleverly placed.
Layer Cake quotes
The Duke: Don't you fucking talk to me like I'm some kind of mug. Don't you fucking talk to me like that.
XXXX: Duke, don't take this personally. It's business. Now, you want to know how much these pills are worth?
The Duke: Yes. Fucking. Please.
XXXX: Now just because you pay a fiver a pop down the local cattle market, don't, for fuck's sake, think these pills are worth millions. They're not. We've got to find someone to buy these pills and they've got to split them into parcels, of say 100,000. They've got to find these people. It's hard work.
The Duke: Oh, you'd give a fucking aspirin a headache pal.
[Dragan is threatening XXXX over the phone.]
XXXX: Dragan, I've got an idea. Why don't you come round for breakfast? I'll squeeze some orange juice and grind some coffee and we can talk about this like adults. How does that sound?
Dragan: Sounds very hospitable.
XXXX: Do you know where I live?
Dragan: No.
XXXX: Well fuck off, then.
[Hangs up.]
Layer Cake easter eggs
When accessing the directors' commentary, press right and you will find a 2nd commentary by different people.