heel | meaning of heel in Longman Dictionary of Contemporary English | LDOCE
In India, both words are used to refer to a railway compartment or carriage. In native varieties of English, only the chassis or the undercarriage — axles, wheels, etc. In terms of meaning there is not much of a difference. In both cases, you are saying that you saw the movie sometime in the past — when in the past, we do not really know. You could have seen the movie a year ago, or you may have seen it just an hour ago. The difference is that with the simple past — I saw the movie — you can afford to be precise about the time. This is not possible with the present perfect tense.
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