Sela Ward was pregnant in real-life during the fourth season. Producers chose to hide her pregnancy, rather than write it into the storyline. Ward never had to take time off from the show, as she subsequently gave birth shortly after the filming of season four was completed.
Initially Patricia Kalember commuted from New York, where her family is based, to LA to film the series. However, after three seasons the traveling became too stressful. She asked to be taken out of six shows a year, so she could handle the commute better.