To find get the secret video tapes, with a video of the making of each area, follow these instructions:
Chapter 1: In Downtown Bikini Bottom, walk to the left of Patrick into the jewelry store and talk to the guy behind the counter.
Chapter 2: Go in the room under the stairs to the news room, in WCEA, once you have the tools. Go into the broadcast room and talk to Plankton. Follow his instructions and then go back and talk to him again.
Chapter 3: Open the closet door on the door on the wall to the right in Spongebob's house.
Chapter 4: In Oxygen Springs, go in the building with Patrick's pants, open the door to the right. It says it is Davy Jone's locker when you point at it.