Have I made any mistakes?
A well-known actor, who the newspapers didn't name, was found by a passer-by lying drunk early in the morning. He was in a sorry state and hardly able to talk, so the passer-by called 999 for an ambulance.
Formally, "who" should be "whom". "who" is commonly used for "whom" outside formal writing, and many people would probably not notice any error. Personally, I prefer "whom" in this sentence.
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Formally, "who" should be "whom". "who" is commonly used for "whom" outside formal writing, and many people would probably not notice any error. Personally, I prefer "whom" in this sentence.
The rest of it is OK.