The two mistakes that come to mind are people who introduce a flood of characters in the first few pages. Where the reader has to stop and get out a flow chart and has to figure out who is who. And you just can't do that - introduce the first four generations of a character's family in the first chapter. You can introduce four or five characters at the most in the first chapter. Another mistake is to use big words that are not normally used in conversation to try to impress folks with your vocabulary.
John GrishamStephen King told me a long time ago, when he gave me some advice about the movies. He said to take the money up front and expect it to be something different than the book and if you don't like that don't deal with Hollywood. But if you take the money, shut up and don't criticize the film because you sold it. The movie doesn't change a word of the book.
John GrishamMr. Buckley, let me explain it this way. And I'll do so very carefully & slowly so that even you will understand it. If I was the sheriff, I would not have arrested him. If I was on the grand jury, I would not have indicted him. If I was the judge, I would not try him. If I was the D.A., I would not prosecute him. If I was on the trial jury, I would vote to give him a key to the city, a plaque to hang on his wall, & I would send him home to his family. And, Mr. Buckley, if my daughter is ever raped, I hope I have the guts to do what he did.
John Grisham