Compared to the planets the moon changes it's rise and set times very quickly. Using the calculator on this page it can be seen that if one were looking at the sky on May 1st, 2014 from Irvine, California the moon set at 10:08PM (which at 8PM would have had the moon most of the way across the sky as noted in the question.)
The moon rises and sets approximately one hour later each day. So, by May 14th the moon did not even rise until nearly 8PM - which also correlates with the observations noted above.
Contrasting that with the other context point made in the OP, using this page we can see that on May 1st Saturn rose at 8:07PM and on May 14th rose at 7:11PM.
So while the moon changes its rise a set times by almost an hour each day, the planets change much more slowly by comparison, in this case only 56 minutes over two weeks.
If one weren't continually watching the moon's progression it would appear to abruptly change positions when comparing it to the planets' movements.