Starring: John Goodman, Laurie Metcalf, Johnny Galecki, Sarah Chalke, Roseanne Barr, Michael Fishman
The Last Thursday in November - S8-E8
Other mistake: Roseanne gave birth to Jerry on October 31st. That Thanksgiving, on November 21st, Jerry was only 3 weeks old. However, he is side by side with Andy sitting in a high chair on his own, sitting straight up, holding his own head up.
Halloween - The Final Chapter - S8-E5
Continuity mistake: Roseanne becomes pregnant at the beginning of Season 7, and it is before the Halloween and Thanksgiving episodes, so she is in her first trimester during the holidays. However, Roseanne does not give birth until the following year in the Season 8 Halloween episode. Her pregnancy has lasted for well over a year.
Trivia: Shelley Winters plays Estelle Parsons' mother in the series, even though in real life she's only seven years older than Parsons.
Question: Was Sara Gilbert (Darlene) pregnant in real life when she was pregnant on the show?
Answer: No. Sara Gilbert has given birth to one child (so far) and that was in 2007.