Loads of things in modules are copied from other modules and even other games, the whole of the Baldurs Gate remake is one big copy !
I've used that sort of thing with the bed for the "romantic moments" in my modules ( without the rat of course ) and focused the camera on various items on tables in cutscenes and nobody's ever said anything about me ripping off Baldurs Gate so I wouldn't worry about it. It's such an insignificant thing that happens in a module that nobody's likely to get up in arms about who invented it and if they do they're just really pathetic.
Most stuff in what we make has been done before it's just a matter of how you put it all together and you can't expect everybody playing your games to think they're having some kind of unique experience at your hands the whole time their PC is wandering around.
If you want to be different, because you must've copied the original Baldur's Gate, scrap the rat and stick in a wandering thief who shrugs and says peasants as he walks out or a dog chasing a cat that's chasing a mouse then a bear after them all.
It's actually all really simple and just involves a small area with a camera set up at the right angle that you just go to during the conversation and the table stuff involves a camera above the table so it's not like it's some great secret. Moving creatures just get spawned and walk to waypoints, how about some ghosts too ?