You can't open the safe door. Go over the ceiling.
You can't open the door. Go over the top instead : climb up and come in through the ceiling of the room.
You can't open the door, but you can go over it.
Use the Cherry Bomb from the tree at the bottom right, which can blast open the cage. (for full solution, see related question)
you dont. go on the shelves beside it and climb. at the top there's an entrance to the vault.
You go up on the roof of the B.A.D. fort and use the fingerprint glass to open the door.
you walk out the door
You need the Fingerprint from the Bistro to unlock the door at the satellite control center. Pass it in front of the sensor and the door will open. (see related question)
you have to go to counterfeit island
you take the eye test and click on the opposite one he points to
When Doctor Spyglass leaves, exit the shop and go to the outside door on the second floor, which is now open.
In the kitchen you have to jump to the ceiling and go through the vent until you reach the door.
There is only one Fingerprint, which you get from the wine glass of a BAD bigwig at the BAD Bistro. (when you use the fingerprint, slide it left and right at the door) (see related question)