This was lost in the outage, so I hope I can recreate it again…
It really grinds my gears when they a female character has a baby solely because the actress is pregnant. The reasoning is usually that they “don’t want to have to stand behind things on set” during their gestation. Phooey on that. Now, Jackie/Laurie Metcalfe’s pregnancy on Roseanne worked fairly well; getting pregnant out of wedlock was consistent with the character, who never did anything by the book. But if it was just a matter of blocking decisions, it shouldn’t have been! She was only “showing” for the first few episodes of the season, and I think that by the time Jackie knew she was pregnant, Metcalfe had already given birth. So she had to stand behind the couch, or in one case, hide behind the shower curtain, when she was pregnant for real, and then wear a prosthesis for the character. Ai-ya.
But there was no good reason for Vivian/Janet Hubert-Whiten on Fresh Prince, or Andrea/Gabrielle Carteris on 90210. Especially since Andrea was a pre-med student: what the heck was she supposed to be learning? And to top it off, both those actresses left their shows before the end of the run! All that for nothing! If I produced a TV show, I would tell all female cast members, “If you get pregnant, you either stand where the DP tells you to stand, or your character joins the Peace Corps.” (Not forever; just until after the birth.)
Titus, on the other hand, did an excellent job of hiding Erin/Cynthia Watrous’ pregnancy. (And she conceived within weeks of the real Mrs. Christopher Titus!) She spent one episode prone on a couch with an injury, and in the thwarted-wedding episode, she held a “bouquet” (actually a floral spray from a casket) in front of herself the whole time. Then, the following season, Chris’ sister announced her pregnancy, and Chris conned Erin into claiming to be pregnant so Sis wouldn’t be able to hog the attention…
Some people are also opposed to the device of one character moving in with a family. I’m not. It made sense for Fonzie to move in with the Cunninghams, because he was getting older and more mellow, and wanted stability. It made sense for David, on Roseanne to move in with the Conners, and Hyde, on That '70s Show to move in with the Formans, because that does happen IRL: a teenager in bad circumstances falls back on his friend’s family. In general, it’s just easier to believe that Character A would move in with Family B, than that Family B would just let Character A hang around all the time.
And one last note. I actually liked Cousin Oliver! Yeah, go ahead and throw things. I don’t generally like the device of bringing in a “younger kid”, but I liked him. The Brady kids were all so flawless and wholesome, they probably all had “Mattel” stamped on their butt. As a skinny, buck-toothed four-eyed kid, I could relate to chubby, buck-toothed four-eyed Oliver. Plus which, he was the first and only person to utter the word sex in the entire five-year run!