The footage of Chaplin at the beginning is from the premiere of The Circus in 1928. Actual footage of Chaplin from the Florodora Girl premiere starts around the 4:46 mark. You'll notice that his hair is dyed black for the filming of City Lights. Lots of other stars can be seen as well.
Click here to see a some still shots of Charlie and Marion at the premiere.
Click here to see a some still shots of Charlie and Marion at the premiere.