Taylor was a cancer specialist when she was first introduced, she was brought in to treat Caroline. She later dabbled in psychiatry, as in telling Brooke she was obsessed with Ridge, etc. I don't have a clue if they still acknowledge that.
Lainie was gone before Katie or Hillary, but you'd have thought the writers would've realized they were down to one nurse (although they always had nurses milling around.)
They did the same kind of thing with lawyers. Ross was the primary (who would flip between being the DA or a defense lawyer) and they'd occasionally bring in someone for a story arc. Robert Lupone as Leo Flynn, Mady Kaplan as Lisa Drevicki (she's the one who Mallet was working for when he was trying to prove Phillip had faked his death), Roger had another lawyer who's name I can't remember, etc.
Harley took a computer course when she was trying to figure out her life. Now, if Alan Michael had gone to college for more than about half a semester, maybe he would've taken some computer courses himself.
Roger was embezzling money through the Spaulding Foundation. His lawyer (the slimy one who had set the Fifth Street fire) had given Harley some drug to get the Spaulding password from her while she slept (or something like that, however it went, Harley hadn't knowingly given him the password) She ended up tracking him down, and once avoided being found in his office by going out on the window ledge.
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P.J. ·