If you look carefully you can see a picture of DJ, Darlene and Becky as kids with a red thing at the bottom of the picture. That red thing is actually a Roseanne script from the original show.
When Dan and Roseanne are sitting on the couch you can see a picture of Glenn Quinn on the dresser behind the couch. Glenn Quinn portrayed Becky's husband Mark. He passed away in 2002 after a heroin overdose.