There are 6 clapboards total to find in this mission. There are 2 per backstage set you go onto.

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Backstage Area 1:

1. Just in front of the crushed plane.
2. Right after you go up to the roof.

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Backstage Area 2:

3. After you exit the scene, there's a bed room set directly in front of you. Go to the bed and turn left and you will see it.

4. This is the tricky one, I missed it the 1st time.. When they talk about Prof. Genki you will see a wrestling ring with 2 huge boxes & a sofa. The clapboard is behind the box with a big pink question mark. Press jump to enter the ring to take it.

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Backstage Area 3:

5. After you run out of the scene and you will see some replacements of your homie. Go further, you will see a place that looks like Zimo's crib, the clapboard is in the kitchen.

6. After you take the 5th clapboard, turn right and you will see a huge robot, the last one is just behind it.

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This is only worth 5G, but it's still a easy thing to do.