This is the one with the megalomaniac potato that tries to take over the Earth. Huck traps him in a “spud-nik” that orbits the planet. Our hero advises us the potato is in a dangerous situation because the rocket could explode. Suddenly, a blast sound effect and black and white cards appear on the screen to simulate an explosion. This kind of thing was done in theatrical cartoons, too.
This is followed by a glowing effect, kind of like a glazing. There are several different versions of brightness; here are three of them.
As I’m not a cartoon director nor a cameraman, I don’t know if they opened up the aperture to allow more light in or used an airbrush to make this visual effect. I believe this was the final time the studio tried this.