The Night the Lights Went Out at Melrose - S7-E13
Other mistake: The whole city is purportedly in a black out, but porch lights remain on during every scene in Melrose.
The Night the Lights Went Out at Melrose - S7-E13
Revealing mistake: At Melrose, Ryan tells Michael the whole block is out of power, but their whole pool area is well lit from the camera crew.
A Christine Runs Through It - S6-E22
Continuity mistake: Jennifer's hair is suddenly a shoulder-length bob halfway into the episode when it was long and curly from the start, and in the prior scenes.
Deliberate mistake: The judge grants wheelchair bound Hilda Mars a million dollar settlement for her injuries. Then Sydney confronts her outside and wrestles her up out of the chair in which Hilda fakes a tumble down the steps. That night Hilda's attorney visits Sydney and admits he knows Hilda is a con who got away it instead of calling it out to the judge.
From Here to Maternity - S5-E24
Revealing mistake: After Michael shows up at Kimberley's place then visits her bedside to be informed that she's very sick, the nurse asks him about any next of kin he can call, and he picks up the phone and immediately dials then says "Hello, Mrs. Shaw?" when he's never once called Kimberley's mother.
Screams from a Marriage - S5-E22
Revealing mistake: Kyle is busy setting boxes of Taylor's things outside as Sydney walks up and asks what's going on. He tells her he and Taylor are separated. Then he sets out a couple of suitcases and Taylor shows up. They get into it in the doorway just as Taylor yells "Go to hell" before picking up the suitcases and suddenly the boxes are nowhere to be seen.
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.
Free Kimmy - S4-E11
Revealing mistake: When Jane punches Jo at the doorstep, the pool appears just a few yards distance behind Jo, when in previous episodes the pool is located in the center court, at least 100 feet from all doorsteps.
Other mistake: Jake Hansen (Grant Show) wears a gold wedding band on his left or hand during the shows run, when he's supposedly single.
Suggested correction: Not really a mistake, just a character choice. Grant Show wasn't married at the time, so it's not his wedding band we see, it's just a ring.
Framing of the Shrews - S3-E29
Factual error: Alison is in her office in Hong Kong and takes a telephone call from Brooke, calling from D&D in Los Angeles. It is daylight outside Alison's window and the office is busy around Brooke. There is a 15-hour time difference between Hong Kong and Los Angeles; it is not possible to have normal business hours in both locations at the same time. (00:14:00)