The written word is different than the moving picture. Yes, I know that's obvious, but apparently some authors need to be reminded. No matter how funny a slapstick scene seems in the author's imagination, it doesn't usually translate well to the written word. "Then Moe tripped over the rake and fell into Larry. Larry landed on his rump and the lemon meringue pie he was holding flew into the air and hit Curly in the face. Curly gasped, wiped the meringue, out of his eyes and picked up a blueberry pie to throw at Larry, but Larry ducked and the pie hit Shemp instead." That's not a real paragraph but it isn't far off. I read a few books of one cozy mystery series that I finally had to drop because the good things were outweighed by frequent tedious scenes like this one among the protagonist and her sisters and I finally couldn't stand it any longer.
Then there are the children and/or animals that an author writes in a way that is obviously supposed to be lovable or endearing but I find off-putting. I recently read a couple of books in a new light little cozy mystery series that features the protagonist's cats. (I say mystery but actually the guilty party in both books turns out to be exactly who was suspected from the beginning with no twists or turns, which is a bit of a twist in itself! But I digress.) I grew up around cats, dogs, and other animals and have had a few cats of my own in the past. I know cats, and I like cats. The cats in these books are utter horrors. The author obviously thinks she is writing them as adorable, but if someone who never had a cat but was considering getting one read one of these books first, they would back off in terror and never think of it again.