i just looked it up. The episode i’m talking about is episode 112 帝丹小7不思議事件 (The Seven Mysteries of Teitan Elementary School Case) i remembered because one of the mysteries was about blood running down the stairs and i think the statues you mentioned too.
The one with the table in the field was indeed another case. All i can remember about that one was a highschool girl with glasses, and freckles committing suicide.
Incidentally the scariest episode i have ever seen in Conan was episode 34 and 35 the Mountain Villa Bandaged Man Murder Case.