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Logically the question cannot be answered. The sentence is grammatically ambiguous, either one could appear in the film. Without context you cannot tell.

Indeed.

Past perfect is used when you are talking about a certain time in the past and you mention something which took place even further past in relation to that point in time. Here's a graphic:

X...

The first two are grammatically incorrect. They are attempts at a direct translation of "надо", correct?

To express "It is not necessary to do it" with "need" you have the following options:
...

You can phrase it like this: which is (the same thing as that which) my friends said when... The part in brackets can simply be replaced with "what".