Marsha offers Roseanne Saturday off paid as a birthday present. However, in "Hair" when Roseanne first takes the job, she makes it clear that she can only work during the week and not on weekends.
Throughout the series, notice how DJ's bedroom door changes sides. During the episode where Roseanne starts to write again, DJ's door is on the left side of the room, but in another episode where Jackie gets abused by her boyfriend Fisher, the bedroom door is on the right side of the room and the left side door leads to DJ's bathroom.