1. Collectible #1 can be found in the player's room in the mirror, to see it, try clicking on the bed and back a few times. To click on the black square, move the cursor to the right (to the corner of the box with the altar in the reflection), because the cursor's position is calculated against default cursor, the center of which is to the left than that of the "Hand" type cursor.
2. Content with the password from Lexi's computer has not yet been implemented, however, you can enter the password: "451" and see the developer's comment.