The Ur-example is the James Stewart movie Call Northside 777.
My most supidest, “Didn’t do the homework” episode is the one where Monk recognizes Trudy’s eyes in another woman, and it turns out that she received Trudy’s donated corneas.
Putting aside the fact that Trudy was killed by a car bomb, and that even if they could find her corneas, the medical examiner probably would want them kept with the rest of the body.
OK: I love this show, and am continuing to suspend my disbelief.
Then Monk has a conversation with the woman, and she *names the disease she had that was cured by the corneal transplant (it’s part of a whole thing where he hears about the beauty of Trudy’s gift, yada yada): the disease is Retinitis Pigmentosa. > KLUNK < RP is a set of diseases of the retina, not the cornea. It’s an unusual coincidence for someone with RP to ALSO have corneal problems
and it would be unusual for someone losing retinal ability to receive a corneal transplant-- and at any rate, a corneal transplant will not fix Retinitis Pigmentosa! Period. Not even Trudy’s corneas.
Another “didn’t do the homework” ending that had me tearing out hair was the second episode, “The Locked Room,” of *My Life Is Murder." I hate picking on this show, because not only is it a show I love, as the show Lucy Lawless is doing currently, but further, this show reunited Lucy Lawless with Danielle Cormack, who played the Amazon Ephiny on Xena.
But this episode blew it.
The solution to a locked room mystery was that the killer had drilled (with a hand tool, yet, to avoid noise) two small holes in an adjacent wall, and shot through one hole while looking through the other-- the “looking” hole was several inches above the “shooting” hole.
Anyone who has ever fired a gun can see the problem there. It’s only marginally better than shooting blind. You can look at what you want to hit, and kinda try to point the gun that way, but unless you actually have the target in the gun’s sites, or you are aiming for, say, the side of a barn, you won’t hit it.
I suppose those are dumb solutions, not dumb methods-- the method in My Life Is Murder was fine, and she couldn’t help that the writers didn’t do their homework.
I don’t even remember the crime in the Monk RP episode-- recognizing Trudy’s corneas was part of the solution, somehow, though, but even if you’ve suspended you disbelief through that, there’s no way to believe that corneal transplants cure RP. The writers could have invented Ophthalmologic Phlebotinum, or something, or called up an ophthalmologist, and asked what things are fixed by corneal transplants.
I don’t know how they came across RP. but if somehow, it was “No one will notice, and it sounds good,” Sorry.