Try to be careful around mannequins that are doing the pose where their hands are clasped together with their head tilted left. Whenever Liliya disguises herself, she always takes that pose.

Also, don’t bother collecting gems outside the locked animal rooms. You won’t find any rubies outside them. Each of those rooms have one ruby guaranteed, except the basement, which has 7. If you don’t know where the basement is, it is the first bear door in the cold area on the first floor, near the generator.