One of the most unhelpful things you can do in a context piece is to go into each paragraph with the mindset of: 'I'm going to write about Hollywood.'
Context is about ideas! The examples are helpful supporting evidence, but they are no substitute for ideas. Rather, a better approach might be: 'I'm going to write about how representations of the past can be constructed, misconstrued, or rewritten, and thus our present realities are a product with our interference with and interpretation of what actually happened.' Then you would link your ideas (as demonstrated in the above comment) in order to guide your discussion towards the Hollywood film industry and the ways in which "historically based" filmms tend to gloss over any wrongdoings on the heroes' side whilst making the opposition out to be pantomime villains. ie. instead of portraying a complex event from a multitude of angles, the story is reduced to 'goodies vs. baddies.'
(Apologies if this wasn't what you were going for, but this was the direction I took it in)
I'm not saying you shouldn't have some idea of what examples you can use (that's what all the practice essays are for) but you have to have a clear and concise contention as well, otherwise your piece will really lack focus.
With regards to dissecting the prompt, same advice as always: QUESTION EVERYTHING!
The ol' who-what-when-where-why from bygone primary school days actually has some bearing here, as it forces you to look at things from different angles. On a basic level:
- Who's representations of the past are we talking about (--> is there more than one? Are anyone's 'true' or objective?)
- What exactly do these representations tell us? And how?
- Why do we look to (representations of) past realities anyway? Can anything constructive/destructive come of this?
- When is consulting the past a necessity and when is it detrimental?
- How do we wish to be seen, and how can reflections of the past affect our present? (Good links to DoaS here)
but hopefully this can lead you onto bigger and more sophisticated questions:
- Are representations of the past purely our own constructions?
- Is how we wish to be seen something we can alter or influence?
- Do the differences between our idealised realities and the actual reality also tell us more about ourselves?
This might seem daunting, but start with the who-what-when-why-how if you need. Once you get yourself into a questioning mood, you'll probably find more sophisticated questions coming to you naturally, then you can ditch the framework and use whatever planning method you need.
And as usual, if you're stuck for examples, click the link in my sig and see if you can find an area of interest, or use one of these to spur you onto another.