Well... I hope you get it. There's really not much to get... This just shows the random things Erik did after the Gala performance (Think of Me). I'll list them and explain for all of you who have trouble.
1. Erik ties a rose, which he'll give to Mme. Giry, which will be given to Christine.
2. Erik sings from behind a wall in the chapel, into Christine's ear. Ventriloquism power!
3. Erik pokes around with his wax doll collection.
4. Erik irons his suit, so that it looks sharp for tonight. (He's got the whole thing planned out already.) He looks at his reflection.
5. Erik lights the candles all around his lair.
6. Erik takes Cesar to a certain spot to await for him and Christine.
7. As he walks down the "mirror passage" he is shocked to see Christine with a man. Raoul. XD