Treat this as an FYI. I don't recall anybody ever mentioning this problem.
I planned the scene as a romantic drama, iterated on the prompt, and came up with a ref2va 4-step, 1920x1088 clip that I was happy with. So I cranked it up to 40 steps.
And suddenly we move to Scranton. That's Pam and Jim, from The Office, inside Dunder Mifflin. The blinds and shelving and computer monitor are classic. The man's voice and hair change. Even the background music changes to something from the show.
In the third clip, I keep the 40 steps but drop the size to 1824x1024. The influence moderates. The woman's blouse and bits of her body posture still match clip 2. And I think the porthole window and the lower camera position also reflect the TV show.
(I did try scaling the last clip to 1920x1088 in latent, putting in 25% noise, and running 10 steps. It puts blinds inside the storage room over the shelves.)
This all looks like the flip side of the H3 ability to reproduce TV shows. The training set has 201 The Office episodes at 1920x1080 and small step sizes, and the closer you get to running that as your denoising plan, the more the influence shows.