When Bullseye says to Kingpin "I want a bloody costume", the
background behind him changes. Also, he's clearly saying the original "I want a fucking costume" line, put back into the director's cut DVD.
When Kingpin is talking with Bullseye, he has a cane in his hand as he walks over to his cabinet to get a drink. When he opens the cabinet, the cane is nowhere in sight. After Bullseye spears Kingpin's olive with a pencil, the cane is magically back in his hand.
In the church fight between Daredevil and Bullseye, Daredevil throws his cane/stick at Bullseye, the camera then cuts back to Daredevil who is running towards Bullseye and his cane is back in his hand (the one he threw), then he picks his cane up from the floor, yet is seen only carrying the one he just picked up.
When Bullseye follows Elektra and her father on a motorcycle, and gets kicked off by Daredevil, we clearly see that he's not holding anything. In the CG and live-action stunt, Bullseye does not hold anything in either hand, yet in the close-up he holds up Daredevil's baton (just after he says, "Drop something?").
When Daredevil is chasing Jose Quesada into the subway a shot from the stairway shows that the digital clock hanging from the ceiling which shows when the next train will be arriving reads 1:58 then 1:57 then 1:56. Then in the quick next shot from the tunnel zooming in on Jose hiding behind a pillar, the display reads 1:37 then 1:36 then 1:35 and 1:34. The clock skips 19 seconds.
After Bullseye throws a shuriken (throwing star) at Daredevil, as he is saying, "I missed," he is sitting straight up on his motorcycle. When he says, "I never miss," he is leaning forward on the motorcycle.
When they are at the party at the fictional "Grand Hotel" in Manhattan, we can clearly see the lobby of the Los Angeles Biltmore hotel in the background. The Los Angeles Biltmore just happens to be located on a street called "Grand Avenue".
Bullseye uses an organ pipe as a club to fight Daredevil. Metal organ pipes are typically made of thinly rolled lead or a lead and tin alloy. If one could manage to lift and swing the heavy pipe, the soft metal would collapse in the hands before even the first blow could be landed.
After Quesada's trial, Matt and Froggy are upset that "another scumbag rapist" was going free. This would seem to indicate a criminal proceeding. If that's so, they would not be prosecuting the case. A district attorney would. Conversely if the trial is civil (as it appears to be since the victim is at the table with the lawyers) then the outcome of the trial would have no bearing on whether Quesada went free or not.
The damage Elektra's weapon does to Daredevil's shoulder should be rendering the arm of any human more or less useless (not to mention the effects of the blood loss!), will or strength regardless. Yet he continues to raise his arm, swing it about, use it in fights and even to support his entire body weight! At the very least there should be a tear in his costume from the penetration, but there is none.
The 'image' that Matt 'sees' using raindrops is inaccurate. Any surface parallel to the direction of the rain would be a blank, as well as any features shielded by another. (I.e.: Chin details would be obscured by the nose and cheeks. No raindrops would fall on the chin.)
In all her battles, Elektra uses her sais in a very incorrect manner. She has her fingers in between the prongs, which eliminates the sai's primary purpose, which is to trap an opponent's weapon. The way she holds her sais actually puts her fingers in danger. Plus, the sais are blunt weapons, not sharp.
During the battle in the church, Daredevil and Bullseye dangle from a horizontal organ pipe. Such an organ pipe is very carefully balanced in the vertical position secured by only one small hook mounted on a wall bracket. Should that hook come undone, the organ pipe would fall to the ground immediately.
In his opening scene in the Irish pub, Bullseye's neck and the top of his chest are peeling from sunburn, because Colin Farrell had just returned from a Mexican cruise while he was on holiday. A sunburn is rather unlikely for this character who prefers to live in shadows and darkness.
When Elektra is standing in the rain at her father's funeral and opening her umbrella, she was already getting wet by the rain before she opened it. As she is entering the limo the next shot follows. While sitting in the limo, she is completely dry.
During the end of the climactic scene between Daredevil and The Kingpin, as the cane is first stuck in the ground we see it on the right-hand side of Kingpin. In the next shot it's gone, and moments later Daredevil drops it right in front of Kingpin although we never see him budge it out from being driven into the floor.
When we first see adult Matt in his "sleep capsule", he has the wound he sustained while fighting Quesada. Later, when he is folding the money, the wound is gone. Later, after fighting and killing Quesada, he goes to "bed" and the wound is back.
When Elektra is firing a gun at Daredevil, after her father has been murdered, she empties a magazine, and then continues to pull the trigger. Since she is using a Glock pistol that has "Safe Action" that would not have been possible. Also when a magazine is emptied the pistol's slide is locked back, making it easier to reload, but in the scene the Glock's slide does not lock back.
The baton that Bullseye throws towards Nikolas Natchios is unaffected by the shock wave from the explosion of the motorcycle which would have deviated the course of any projectile within range of the shock wave event.
Daredevil kicks Bullseye off the motorcycle, lands on his feet, and reaches for his club. Both holsters are empty, and Bullseye uses his grapple club to kill Natchios. Yet, when Elektra starts shooting at Daredevil, he uses his grapple to climb a wall and get away from her. Where did he get it?
When Urich shows up after Daredevil pushes Quesada onto the train tracks, he throws his lit cigarette into some kind of flammable liquid on the ground in the shape of Daredevil's "DD" logo. Did Daredevil squirt that liquid on the ground and just hope someone would come along, notice it was there, and drop a burning object onto it to light it?
When Bullseye pulls the blade out of Elektra, there is no part of the knife sticking out the back as there is in the previous shot. Also, the sai is clearly not penetrating the leather of her top while jutting out of her back.