If you press the cruise bubble and bubble bowl buttons on the same frame whilst walking against a flat wall, Spongebob will enter into a state where he slowly moves forward even if you aren't tilting the control stick at all. If you go against a flat surface in this state, Spongebob will slowly drift either right or left. Slightly tilt the control stick in the opposite direction and press both buttons on the same frame again, and Spongebob will move forward much quicker. This is known in the Battle for Bikini Bottom speedrunning community as a "Cruise Boost".
In the Jellyfish Fields level, SpongeBob eliminated the King Jellyfish so why would Mr. Krabs afterward tell Patrick to go get the King Jellyfish. Besides, there's no way in the level for Patrick to go get it.