In the bar, Jessie comes up alone from the secret elevator, but as the view pans, someone else enters from the same direction despite there not being enough time for anyone else to come up.
The sun lamps as viewed from below are not grouped together as they are in the mission to destroy Reactor 5.
In spite of Barrett shooting and obviously damaging the plate separation terminal, it is undamaged later in the cutscene.
Tifa mixes a drink for Cloud. After he drinks it, she shakes the mixer again and a different drink pours from it - even though she did not put anything else into it.
Grammar mistakes in in-game text.
In the side quest to find the children of the orphanage, one of the children 'on patrol' says that she helped an old lady cross the street, even though there is no vehicle traffic to pose a danger.
At the sun lamps there are vehicles that are too big to have been able to have been driven there.
Some things such as metal girders and large stones can be moved around simply by walking against them, where they move as if they were as light as a feather.
At least one of the cargo arms in the tunnel is not close enough to the console for safe operation.
The playground in Sector 6 is of a very dangerous design. No playground architect would ever design a playground so dangerous.
There are vending machines in places where it is doubtful that people go to very often, especially to maintain them.
The assault on the warehouse is to start at Tifa's flare. Flares are not a good idea, as they can draw attention.
Given that there are more A.I. programming cores in the disposal facility than were sent there, some of them would have to be defective and therefore useless to the team.
Mako is not supposed to be volatile; therefore, the time limit at Reactor 5 should be meaningless, since the blast shouldn't be strong enough to cause a large blast radius.
If Tifa beats Ronnie at pull-ups, he says that she is better than she was before. Ronnie never met Tifa before.