In It's a Wonderful Life, writer-director Frank Capra helped create a new type of artificial snow because the current movie method (using cornflakes that were painted white) was too noisy when the actors had to walk in scenes.
At the time, it was also popular to use asbestos as snow in films. But this new technique made filming a lot easier for Capra, rather than having to film the picture and audio separately and dub it in later. It also earned Russell Shearman and his team a special Technical Achievement Award at the Oscars.