The door was in the floor the way a door is normally in a wall.
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yckelvinWhy use the preposition "in" but not "on"?No reason. Idiom. I guess you could think of it like the way a hole is in something, and a door is a kind of hole.
yckelvinWhy use the preposition "in" but not "on"?On the floor would indicate that the door was simply resting on the floor, like a rug lying on the floor. In indicates that it is part of the floor itself.