You can access the Lab without going through the scanner when entering from the Manor by going through the sludge. That’s what I meant. The scanner will detect all parasite including Venus, Squidrabbit and Unwidow. It will also detect if you’ve interacted with the futas, though that should reset when waking up. C-Alpha, or even the decontamiantion spray should remove all of those.
The red ghost has a randomized appearance each time. There are no variants. The transformation lasts for 7200 frames(120 seconds at base framerate). If the player is doing something that would conflict with transformation (i.e in an animation or in a menu) the timers is delayed by about 30 seconds. The transformation should always disappear when you enter Jessica’s room or when you wake up.
The mirror transformation is permanent.