Movie trailers were originally shown at the end of movies, hence the name trailer. They were moved to the beginning because most of the audience left after the feature film
In most advertisements of watches, the displayed time is 10:10. This allows for easy viewing of most logos as well as heightened sales due to its resemblance of a smile on the watch's face.
Earth's rotation is changing speed. It's actually slowing, and this means that, on average, the length of a day increases by around 1.8 seconds per century.