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Having Capital letters in the URLs are not bad for SEO, Google consider this case as negative seo and it will not affect your ranking, but i recommend to use lower case in URL because it is User-friendly and SE friendly,  and may be possible that you will have duplicate content issue if search engine see variations of upper and lower case among URLs that all evidently point to the same content. Read matt cutts's advices on URL http://www.seosean.com/blog/matt-cutts-advice-on-urls-page-names

Some things are mentioned below, I don't want to give the farm away but hopefully this sparks some ideas for you. Find a way to get unique information when URL 1 & URL 2 are compared against each other. Perhaps put an additional snippet of text that says when these trailers were released or put in a transcript of these videos on the page. Other ways to differentiate the content includes curating all the teaser trailers on URL 2 for that movie (because you know there will be more than one if the movie is especially popular). You could make the synopsis shorter in the teaser but bigger and more detailed in the full film teaser. You might additionally want to create a method where users can upload additional versions of the trailer so you create a system (upon approve) where you get free new content for your site. You may additionally want to include reviews by critics on the short teaser and the full teaser as a way to generate unique content through UGC (user generated content). Make sure these reviews are marked up with rich snippets and schema. Perhaps you can implement gaming dynamics and reward these users when they provide UGC by assigning points and give away gifts - its a way to generate unique content for your website and differentiate it from thin affiliate sites.

I agree with EGOL and Ryan, it looks like you have a lot to go on already. Good luck to you!