Midsomer Murders (1997)

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Continuity mistake: In the first episode of season 10, when Marissa is holding a dog while talking to Elaine, the way her arm lies around the dog's neck changes several times between shots.

Bad Tidings - S7-E2

Continuity mistake: When Helen Grace is in the retired GP's house choosing which apple she will eventually stuff in to her victim's mouth, her hand wavers over one apple, but instead chooses another. At the end when we see a flashback of that scene, she picks up the first apple she was originally going for.

Chimera

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Plot hole: In the Pudding Club episode, when they visit the secret room, all the candles are lit even though no-one is in there.

Orchis Fatalis - S8-E3

Revealing mistake: Dead lady blinks when Barnaby enters the room.

The Made-to-Measure Murders - S13-E2

Visible crew/equipment: A crew member's shadow is seen moving behind an open door that a character is walking by. (00:15:45)

Garden of Death - S4-E1

Continuity mistake: When the police unearth the body of Ms. Bennett, she is deep in the hole where she was interred. However in the flashback, the killer dumped her into a really shallow grave, in fact most of her was exposed.

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Factual error: Whenever the killer (always dressed in black with a balaclava disguising his/her identity) uses a knife, the blow invariably is an overhand strike. However, a knife in a downward thrust quite frequently simply skids off the overlapping ribcage of the victim.

Strangler's Wood - S2-E2

Plot hole: Several shots show Barnaby reviewing a newspaper announcing a new death in Strangler's Wood, the Brazilian Woman. No one supposedly knows who she is, as the article states, but the photo of the dead woman is a professional headshot from when she was alive. How could they have obtained her headshot if no one knows who she is?