Other: When Bahamut is summoned by Kadaj, he uses what looks like a green (magic) materia instead of the correct red (summon) materia.

Revealing: When Kadaj kneels in front of Rufus Shinra, watch his sword. As he kneels, it goes through the floor.

Other: Cloud finds Tifa lying on the flower-patch in the church, after the fight with Loz. When we first see her she has her leather gloves on, then the next shot her hands are bare, and again in the next shot she has her gloves again.

Revealing: In the final battle of Cloud VS Sephiroth, when the Shinra HQ is collapsing, in the final shot of the building collapsing, one of the pieces of rubble is not there for about one or two frames, then it suddenly appears. A slip up in the CGI rendering.

Revealing: During the Bahamut attack scene, in some of the wide shots above the city, you can see some of the people (All computer generated) running "through" each other.

Continuity: When Yazoo jumps/flips over Cloud's motorcycle in the opening chase sequence, the way his motorcycle is flipping through the air changes slightly between shots.

Revealing: When the giant crowd has gathered around the memorial before the Bahamut attack scene, you can see some of the CGI people are using the exact same body animations.

Continuity: When Loz/Yazoo/Kadaj are summoning the creatures to attack Cloud in the beginning of the movie, the number of creatures changes between shots.

Continuity: After Sephiroth turns back into Kadaj when defeated by Cloud, Kadaj is carrying his weapon. However, Kadaj had lost this weapon before he turned into Sephiroth and Sephiroth's own weapon was created with him. Therefore Sephiroth's weapon couldn't transform into Kadaj's when Sephiroth is defeated.

Revealing: After Aeris resurrects Cloud, he finds himself rounded by children in the pool of water in Aerith's church, but when he stands up he is completely dry.