1 is the CG Scene you see when you first enter the Bakery and see Lisa. That one should definitely be unlocked. Not sure how you would get on the bakery route without seeing and unlocking that one.
3 is unlocked by choosing to snoop on Lisa and Keith.
17 is unlocked in one of the office scenes with Leon and doing what he asks. 18 is unlocked in the same event by doing what he asks you to do and not denying him.
Hope that helps!
