Other mistake: After Brooke blackmails Amanda for the position of company vice president (over Amanda's affairs) Amanda gives in and calls a short conference with Alison, Brooke, and Billy, and openly demotes Alison to 'assistant'. Which is impossible, considering Alison is the company vice-president. And only a higher ranking head could call such a shot, while Amanda is an accounts executive with no such power or authority to overthrow anyone above her.
Melrose Place (1992)
1 other mistake in season 4
Starring: Heather Locklear, Josie Bissett, Thomas Calabro, Andrew Shue
Desperately Seeking Samantha - S6-E5
Continuity mistake: As Ernie the cook is exiting the restaurant kitchen with full plates of food in each hand, Samantha enthusiastically surprises him and he immediately hugs her, but his hands are now empty. (00:17:30)
Nurse Amy: She's your wife's landlord. That would be your present wife, number four, isn't it? And she wants all your belongings out of the house by to-night.
Michael: And did she say why?
Nurse Amy: Nooo, but I'm sure we'll be reading about it in tomorrow morning's newspaper.