Revealing mistake: 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.
Continuity mistake: 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 mistake: 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.
Revealing mistake: 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.
Revealing mistake: 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.
Audio problem: In the scene in the church where Tifa and Marlene are confronted by Loz, Loz approaches the two as he's talking and his boots are easily heard on the wood. When he notices the flowers, the scene shows, as he's looking down and the flowers are surrounding him, that the wooden floor is gone. When he asks, "Where's mother?" he takes a step forward and his boot is heard on wood. A few seconds later he takes another step, followed by the same boot on wood sound, when there shouldn't be any wood below him.HulkObsessedChick