Here are some glitches I've found so far that are fun and interesting.
Food Refresh - Press sort or move your food outside your inventory. It will be back @ 10:00
Pal-Catch Jump - Throw a palsphere at any pal, then climb on top of the sphere. When it finishes shaking it will launch you flying into the sky - very goofy.
Synergies with the next glitch
Faster Sliding/Gliding - Press 'C' to slide. When you slide down an incline, you pick up radical speeds. You retain speed as long as you never start walking.
At max speed, feel free to jump into a glider and you will retain your speed. I recommend the Pal Killamari as it's the best glider as far as I've seen @ Lv. 18
... Finally, combine these two glitches. Find any of those Simba rocks jutting out of the ground or possibly use the bottom side of a roof ramp. Position your pal-capture underneath, then rocket into it. Inconsistent, but if you hit the right angle you will redirect your momentum horizontally.
Underwater Base - Reddit warning: Here is the source for this glitch. I've been under the ocean, but not in the rivers. Pretty cool!
Wall-Clip - I used Nitewing for this. Ride your pal next to a corner. The rougher, the better! Next, spin or wiggle then get off. Eventually you will clip through the wall.
I AM NOT RESPONSIBLE FOR WHAT HAPPENS ON THE OTHER SIDE
Worth noting, you can skip dungeon boss rooms by doing this. Should be possible to do high level dungeons and get silly loot early on but idk what that even does at this point XD
You can also go up towards the ocean because dungeons are literally underground. I refuse to risk my pals for this science however.
Infinite (Horizontal) Flight - Mount your flying pal and rise into the sky. When you run out of stamina, demount into your glider. Before you run out, make sure you're close to the ground so you don't take fall damage!! SUPER IMPORTANT because swimming without stamina costs a lot of health. Your flying pal should be nearby; Hold E to summon it towards. It will now have full stamina. Repat~
That's all I know so far. Share more if you find anything cool!!!