You're in the land of arcane exceptions now, Shiv2016!
Technically speaking,
past perfect tense doesn't actually need to be used alongside another action in simple
past tense -- you just need some sort of clear "reference time" that also happens in the
past. So yes, your examples are technically correct: "the end of the movie" works as your reference time in the
past, even though there's no simple
past tense verb here.
Here's the thing, though: I'm not really sure that it's a big deal on the GMAT. Yes, you see
past perfect all the time, but the "reference time" is almost always another verb in simple
past tense. I can only think of one exception to this: somewhere in the GMATPrep exams, there's a question that uses
past perfect in the correct answer, but without a simple
past tense verb -- very much like your examples. Unfortunately, I can't find the question, but I'm certain that it's out there -- maybe in Exam Pack 1? If that rings a bell, please let me know.
But again: 95% of the time, you're fine with the simplified version of the rule on the GMAT:
past perfect tense usually needs to accompanied by another (later) action in simple
past tense.