The water pack is fun, but definitely not a replacement for certain other more entertaining gameplay elements found in a certain predecessor...
The film roll is simply a graph, displaying instantaneous stages of existence in reference to a point in time. Give the film an infinitely large framerate, and you'll have physical(spatial) points in the frame be continually existant. Problem solved. A "point" in time is just a instantaneous slice of existence for us to look at."
And WesDawg's example is the real-world experiment to test Einstein's theory of relativity. One of the conclusions, in general terms, is bundles of matter (like a person, or even an aircraft) have different time frames, depending on their speed. The faster you travel, the slower your time frame becomes, relative to objects moving slower than you. So, if the pilot who travelled faster (very, very fast) watched his clock as he flew by, he/she would think was operating at the normal, usually perceived speed. But outside his craft, the rest of the world (or some other slower frame of reference) would seem to be moving faster, whose clocks would seem to move along faster. A minute on the earth would seem to go faster than a minute in the craft (according to the pilot). Conversely, if we're on the earth, a minute on his craft would seem slower than a minute we measure here; the pilot's clock slowed down, according to us. Therefore, from the pilot's perspective, he "moved forward in time."
For particles above the atomic level, the math works out just fine for the phenomenon mentioned above. For subatomic particles, and even smaller, things get CRAZY, and we haven't been able to measure it well.
Come again for another brain-busting episode of MR. WIZARD'S WORLD.