Movies are a little more ambitious than what I've heard of. True, most astronomical work does require time exposures (usually on the order of minutes or hours, even with huge telescopes), so if the geometry of what you're observing is going to change substantially over that time, interferometry will not work.

The type of work optical interferometry is used for that I'm personally familiar with was for astrometric work (precise measurement of star positions). Although that work can also be adapted to exoplanet searches (looking for planet-induced wobbles) I'm also familiar with it for determining star shapes (like the Betelgeuse experiment I mentioned above). That was done by placing a mask over a telescope mirror with two holes cut in it, and the starlighlight from each hole bounced around by mirrors and directed into an interferometer where the interference fringes could be exposed on a photographic plate. Careful measurement of the fringe spacing with micrometers and microscopes provided the numerical data that could be use determine the "shape" of the star, and whether it had any companions.

But its been a long time since I've kept up with that sort of work, and I'm sure the technology has improved enormously. Today, I'm sure it would all be done numerically, the interferometer output probably captured in some holographic format, written onto some digital medium, and then processed by software.

I may be mistaken, but my instincts tell me imagery of continents and weather patterns on earthlike planets around other stars is not going to happen any time soon. It may be theoretically possible, but actually building interferometers that big would require an advanced spacefaring technology just to build and maintain the equipment.