Here's how it will work:
1-Quentin passes out after getting out of the neighbors basement in act 1
2-Quentin wakes up at night
3-Then go stands outside looking around with binoculars
4-Then when he looks at the museum he spots mr peterson looking through the window looking at him
5-The mr peterson disappears behind the curtains
6-Then you have to go to the museum to grab the shovel and pass out again starting the next act cutscene of him waking up