Computer Hal won't open case. You need Charlie's fingerprint and his DNA (click on the both scanners).
Leave the shop. Look at the note, take it and a piece of scotch tape. Go to Clayton's Cave and ask Elaine about free alcohol drinks. Order every drink of the menu.
Go to the restroom, then back to Elaine and tell her that the toilet is a mess and there is a huge mirror.
Take a trash bag and exit the pub by back door. Throw the trash bag to the dumpster.
After conversation with bum go to pub and again to the restroom. Take a make-up kit.
Come back to the comics shop. Take Charlie's soft drink. Use the make-up kit with the glass and take the fingertip by using the scotch tape (taken from the bum's note).
Use the tape with fingerprint with the upper scanner and the straw with the lower one. Take a catalog. Put it back on its place. Use the hammer with Hal. Now Randal can take the catalog.
Go to the Randal's apartment and then to his room.
For ending the second chapter you'll unlock the achievement 'Day 3' (on the beginning of next chapter).