Pick up the bottle.
Read bottle label
Look at the paper on the desk/table.
Wear chair on head and walk out
Throw desk out of window and surf down buidling with it
Check phone for recent calls.
Check desk drawers if there is any.
Examine note again incase there's a number or anything you missed.
Take that key
As hacker said, lift up the phone.Also, that picture on the note is what i believe a semiquaver.
No really, look under the phone. I feel like there's something under it.
Look on the other side of the note to see if there is a letter