Carrie Fisher was not taking the Stormtroopers seriously
Between the second and third draft of the movie A New Hope, George Lucas had the idea of replacing Luke Skywalker with a princess he had as well been working on. Lucas ditched that first idea and instead chose to keep both characters in the film.
Throwing snowballs with Carrie Fisher
In the first costume concepts, Jabba The Hut originally had a human face, legs and was taller and far slender. In fact, in the original filming of the movie he was played by a human actor, and the due to time and money issues that scene was cut.