Battle for Bikini Bottom boss arena exploration

A couple things have been learnt:
1. The spatula in each boss fight is indeed hidden somewhere unreachable
2. The "instant win" area during the first part of the Musclebuff Buffpants isn't actually the spatula as some had guessed, which confuses me as to why it exists
3. The realistic fish head can be found in every fight, sometimes with the spatula
4. Collecting the spatula does not end the fight, and presumably does not give you the new bubble ability or open up the next area of Bikini Bottom
5. It is impossible to continue the game after collecting the spatula manually (with the possible exception of the Robot Sandy fight, but the spatula is in an enclosed space, making it seemingly impossible to collect)

I looked around in the second portion of the Musclebob Buffpants fight, and enjoyed walking on top of my own giant nose while also finding a random solid grey platform and light (the one from Patrick's dream, I think? The one illuminating Patrick?) underneath the arena, but I couldn't for the life of me find the realistic fish head or spatula. My guess is that it's an enclosed space, such as the robot's ears, that can't be gone through or seen inside of.

All in all, none of this is particularly useful information, but it did prove that trying to find tricks like that found for the first Musclebob Buffpants fight is an exercise in futility. All of the spatulas are in (fittingly) impossible-to-reach areas and effectively hangs the game. Collecting Robot Sandy's would be useful, but it doesn't seem possible.