Factual error: When we see the burning 'DD' in Joe Pantoliano's glasses it is not a reflection. The DD should be backwards in his glasses. (00:26:55)
Continuity mistake: Near the beginning of the movie we see that Matt has many visible scars on his back. But when Matt Murdock and Elektra are having sex in the bed there's a shot of Matt turning over onto his back, and almost all of the scars are gone.
Continuity mistake: When Matt enters his office, his secretary is holding the invitation with 'Saturday, July 24 at 8 p.m.' on it. When Matt wakes up from his night with Elektra, however, the invitation he has reads 'Wednesday, August 13 at 7 p.m.'. (00:44:40 - 00:51:50)
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.
Answer: Hang on, by Seether.