Revealing mistake: When Bullseye lifts Elektra and keeps her by the throat, you may notice her back - her outfit is not tight, as usual. The cause of it is the safety wires which help to lift her.
Factual error: After Matt beats down King Pin, he throws a rose off the roof and says. "This is for you, dad." The rose then spins and falls in various positions, hitting petals first on the ground. This would not be how it fell. The petals are light, and the stem heavier. Plus, the petals would have more air resistance. The rose would have fallen stem first the full way down and landed on that.
Factual error: Even with a highly sensitive sense of smell, Matt could not possibly have smelled Electra walking down the street towards the diner that he and his friend were sitting in. There was no evidence of wind, as judging by her hair, and she had not even opened the door yet. Without wind, the air particles, which would carry her sent would follow behind her in a wake. They could not have gotten to the door ahead of her without wind, much less get though a closed door for Matt to smell her.
Continuity mistake: When Bullseye stabs Elektra it cuts to a view where you can see the sai go into her stomach and out her back. Then they go to a close up of Elektra's face to show the agonizing pain she is feeling. When they zoom back out, Bullseye still has the sai pressed up against her belly, but yet it's not sticking out of her back. Then he finally pulls the sai out of her stomach.
Continuity mistake: In the first church scene when Daredevil drops to the church floor, his cane falls to the floor immediately afterwards. However, towards the end of the flashback sequence when he falls to the floor, his cane never hits the ground, though it is given ample time to do so.
Continuity mistake: In the first cafe scene right before Elektra comes in, Matt's partner hands him mustard instead of honey. While squirting the mustard, some drips off the container and onto the lip of the mug, but when Matt switches the mugs, it's gone.
Continuity mistake: Close to the end of the scene where Elektra is practicing in her room with the sandbags, she throws a sai into the sandbag with Daredevils face painted on it. The camera then switches to behind her looking down the length of the room, showing the same sandbag without a sai in it.
Continuity mistake: When Daredevil and Elektra are fighting, Elektra is wearing her charm necklace in the beginning of the fight, but after stabbing DD, she is not.
Suggested correction: In the film it is shown that her necklace drops to the ground (chain break most likely) when DD manages to grab Elektra in a choke hold. This occurs about 30 seconds before she stabs him.
Factual error: Someone already mentioned the dates on Matt's invitations are different, but if July 24th was supposedly on a Saturday, then there's no way August 13th could be on a Wednesday.
Continuity mistake: When Daredevil comes home you see stairs with a wall on the right, from Daredevil's point of view, then in the next shot he's gone down one step and there's no wall on his right, it's now on his left with his dad's gloves on it.
Factual error: When Bullseye is shot through his hands by the sniper, he spreads his hands with the palms straight outward. This would be impossible, because since the bullet went through the back of his left hand and come out the back of his right hand, the bones of his fingers would be bent accordingly. The fingers on his left hand would be bent backwards, while those of his right would be unable to open completely.
Continuity mistake: After Electra stabs Matt with her sai, she is bent down to him, with the front of her hair raked back over her ears. When she stands up in the very next shot, her hair changes to being straightened out.
