The vignette on the back of the $100 bill is Independence Hall in Philadelphia. There are three people depicted in the engraving. Two (a man and a woman) are in front of the hall close to the building; the third person is a man pictured looking toward the building. There is no record that the man and woman are embracing.
The hands of the clock are set at approximately 4:10. Although the time is not readily identifiable to the naked eye, it may be verified if examined under twenty-fold magnification. There are no records explaining why that particular time was chosen.