- Revealing mistakes: When Dae-su enters the room of one of his nemises, his computer screen shows information about the stock exchange. The internet address on the screen is: C:/DocumentsandSettings/[...]/#OldBoy#/[...], thus a link to a folder on the computer, rather than an internet address
- Revealing mistakes: In the scene when Woo-jin Lee was pulling Lee Soo-ah's hand on the bridge, there was an angle that showed Lee Soo-ah's dummy stunt double.
- Revealing mistakes: When Woo-jin Lee is searching through the Internet for the word "Evergreen", you can see that the high school website already has been visited on that computer because the link is highlighted in purple colors.
- Crew or equipment visible: When Oh Daesu passes out after eating the octopus, you can see camera equipment reflecting in the silver platter dish as the scene zooms out.
- Continuity: The last scene at Woo-jin's penthouse, while he is getting dressed, his shirt cuffs already have cufflinks in them; in the next shot, they are missing, and he is putting them on.
- Errors made by characters (possibly deliberate errors by the filmmakers): Main character states that lack of sunlight has left him depleted of Vitamins A and E. These are obtained through diet. Sunlight is only responsible for the production of Vitamin D. Thus, the character should only be depleted of Vitamin D.
- Factual errors: Oh Dae-Su states that the maxim, "Free yourself, like a gazelle from the hand of the hunter, like a bird from the snare of the fowler," is from Proverbs 6:4; these numbers are emphasized shortly afterwards. The saying is actually from Proverbs 6:5.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Continuity: SPOILER: After the corridor scene (when Oh Dae Su gets stabbed in the back), when he gets out to the street his suit is not torn as if nothing happened.
- Continuity: SPOILER: Woo-jin cocks his gun twice in a short period of time: just before he's about to shoot himself in the head along with Oh Dae-su, and during the flashback scene when he's in the elevator.
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