Just guessing here, but the difference in railings between Rivendell and Minas Tirith could be a subtle hint from the filmmakers. I don't think they'd make hobbit-sized railings in FOTR without a good reason. The reason may be to emphasize the contrast between the two places; Rivendell is a cozy, accommodating refuge; while Minas Tirith is a besieged fortress that has no room for indulging hobbit-folk with railings that are just the right size.
Or maybe it's just an honest mistake. Who knows?
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"If you're referring to the incident with the dragon, I was barely involved. All I did was give your uncle a little nudge out of the door."
THE HOBBIT - IT'S COMING
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