In the episode Couch Potatoes, Dan and Roseanne are sitting on the couch talking about how Roseanne doesn't like the new couch. Pay attention to the sandwiches on the tables and you'll notice that they constantly warp from Dan's table to Roseanne's and back again throughout the whole scene without either character moving them.
That's the point though, the sandwiches aren't moving in the scene. It's a continuity error between shots that could have easily been fixed if they were paying attention while filming.
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