After the start of the introduction, shows a newspaper with the word "bizzare" spelled wrong.
At the kitchen cut scene where the zombie walks down the stairs, the door is Grey yet, when through that door, it's brown.
When the first hunter runs through the central courtyard, the first metal door it runs through is missing, and so is a wall around that first metal door.
In the Jill game-play, when Barry drops a rope for Jill to climb down, after she climbs down, the rope falls and completely disappears. However, there's no hole or trap door in the floor for the rope to disappear. The rope literally went through the floor and the game went on as if it really did go through the floor.
Towards the end of the game (if played correctly), the warning announcement on the PA says: "Unlock all routes for evacuation," but because of the triggering system being activated the entrance elevator is stalled. Also there are a few doors that are still locked under the triggering system.
Spelling and grammar mistakes are present in the in-game text.
There is a typewriter room wherein some shotgun shells and acid bazooka rounds are located. The sign outside says that bullets can be found within, not shells and bazooka rounds.
The corvids do not make the noise of any of the corvids found on the North American continent.
Mr. Burton has acid rounds at first but no launcher with them. It would stand to reason that if he came with acid rounds he would also have brought the launcher with him.
In the beginning of Jill's scenario, Barry gives Jill a lock pick, claiming her to be an expert in using one. However, it is described in the game manual that Barry is an ex-SWAT team member, who are trained to use lock picks in various properties.