47 Ronin (2013)

Continuity mistake: In the scene where the witch gives Mika the dagger to kill herself with, the witch stabs it into the floor. When the witch leaves the dagger is lying on the floor. When Mika goes to grab the dagger it is stuck in the floor again. (01:15:20)

Plot hole: Every single one of the ronin are portrayed as being extremely lax with their most prized possession, their swords. When they first gather, one of the ronin tells Oishi "We do not have any swords", whereupon Oishi casually hand over his own. First of all, only the most poverty-stricken and desperate ronin sold their swords, as giving up one's sword was the ultimate humiliation for a samurai, it was a denial of both one's status and legacy. Secondly, selling your sword would mean never being able to be employed as samurai again, or even to be hired as a temporary bodyguard. Thirdly, swords were often inherited from one's father, or given as personal gifts by parents or lords, not something one would willingly give up. It is possible a few of the ronin would have been driven to selling or otherwise losing their swords, but not every single one of the 50+ ronin who gather. And those who still had them would be extremely loathe to even lend them to others.

Twotall

Continuity mistake: In the scene where the 47 ronin are granted a proper samurai's death, the shogun first has the black strap of his headpiece under his lip, then under his chin and then under his lip again. (01:41:00 - 01:42:40)

Mika: My father taught me this world was only a preparation for the next, that all we can ask is that we leave it having loved and being loved.
Kai: I will search for you through 1,000 worlds and 10,000 lifetimes until I find you.
Mika: I will wait for you in all of them.

Ôishi: No one, but you and I, can know that you are, and will always be, the joy of my life.

Tengu Lord: Was it worth it what you found in the outside world? The love of a woman you can never have?
Kai: Yes.
Tengu Lord: No matter what you do, Mika will never be yours in this life.
Kai: Then I will go to my death and pray I find her in the next.