These both give a sense of past tense. The first one tells the exact time (last night) The second one just confirms that you have watched the movie at some (undefined/unimportant) time. In the second case, we usually use 'have seen' instead of watched.
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| 1. | in or to every part of; everywhere in: 'They searched throughout the house'. |
| 2. | from the beginning to the end of: 'He was bored throughout the play'. |
| 3. | in every part: 'rotten throug |