Projectors and motors are analog devices. Even step motors do not move from one position to the other instantly.
In theory you could tell the build plate to go up 100 microns and tell the projector to change the image while taking into account what happens between the two stages. While the motor moves and the lights change color. So you can create different kinds of continuous transitions between the stages.
This applies to every discussion about digital/analog of course.
A "movie" depends on the tech presenting it. For typical projectors, yes. It's discrete frames.
Other displays could vary! A display capable of incrementally updating the picture could show motion as a series of changes without there actually being a frame, just deltas... Done quickly, this would approximate what the human eye does.
In the context of this process, "frame" would refer to the changes to the projected image. Each of those changes would be a "frame"
But, if the object being rendered is actually in motion during the cure, there will be interpolation between those "frames", resulting in a very analog like product.
The motion would be "frames" too, as each micro-step would presumably be a controlled atomic thing, but those movements would not necessarily need to be keyed to the changes in the projected image.
Take both of those up in terms of rates and precision, and it's all going to blend together, particularly as both push the material to it's change rate limits.
Think "motion blur" when motion exceeds capture rates, or in the case of analog film, where reality "smears" onto the film while a shutter is open.
In theory you could tell the build plate to go up 100 microns and tell the projector to change the image while taking into account what happens between the two stages. While the motor moves and the lights change color. So you can create different kinds of continuous transitions between the stages.
This applies to every discussion about digital/analog of course.