Could you tell if there is any difference in meaning between the following sentences?
I watched the movie many times when I was a child.
I had watched the movie many times when I was a child.
Are both perfectly natural?
Could you tell if there is any difference in meaning between the following sentences?
I watched the movie many times when I was a child.
I had watched the movie many times when I was a child.
Are both perfectly natural?
I don't think the simple tense is what you are fishing for. The second sentence is more likely to be said, especially if you aim to express the completion in the past. But AmE doesn't necessarily rely on the perfect aspect unless it's necessary.
e.g.
Since when did you own a word processor?
I was here since before 8 a.m
I wouldn't say your first sentence is plain wrong or it's not uncommon but the second one is preferable, at least to my ear. Like I said, completion.
That said, both are natural and interchangeable.
To sum this up, it's not one of those verbs you'd use to express your behavior or habits in the past as in:
I was addicted to that movie when I was a child.
or
I used to/would play that movie over so many times when I was a child.
If you look at these sentences as answers to the questions you could see the difference.
Second one is an answer to the question: "Had you ever watched this movie?"