@roger,
I agree roger, but I was thinking of something after my first post.
Re the words "saw" and "watched"
Might be subtle and essentially unnecessary in regards to movies, but, it's there.
If I say I saw something, it's more in an "I observed that happening" I might not have been engaged in it, just passively saw it.
If I watched something, I was actively viewing it, watching it change. It seems to me it's what you do over a longer period, and that you found it interesting.
It also seems it has a different time passing, or passed meaning.
If someone asked me about a movie from a long time ago, I might say "saw"
As in "I saw Jaws when it first came out in the 1970's, it was great."
Or, if asked about a movie not well liked, I'd probably saw "Yes, I saw it"
If it's about a movie you enjoyed and/or paid attention to, and it was recent, I'd probably instinctually say I watched it.
So if I was talking to my sister later that day or with a week to a month, I might say "I just watched (name of movie). It was really good.
Bottom line though, either saw or watched could be used, and it would be correct.