I could video it with my iPhone, but the boxes and texts are only up for fractional seconds. . . There have been only those three so far and no warning for when they will flash on the screen. It would be hard to capture. I could have tried recording the on-demand, but who knows when it would do it again. . . but on-demand doesn't capture the screen, or any overlays. It records the incoming digital signal, not anything added on top of it. I don't have any VCRs any more.
This is like the “subliminal advertising” rumor of the 1950’s that movie patrons were feeling a sudden urge to go to the lobby & buy snacks. They believed a single frame with the words “Buy Popcorn” had flashed on the silver screen for an instant.
Technology is worlds improved since then. Just sayin’.