Found a game freeze bug (may contain minor spoiler) and some tricks.

There are some challenge areas where Mario has to temporarily give a scarecrow Cappy before going into the blue door. If somehow he died right before the door opening cutscene, the game will freeze.

In my case, Mario was spinning on the ground, jumped, threw Cappy out and dived into a hole of death. The moment he died, Cappy accidentally hit the scarecrow and the game just froze. I guess it was confused on which cutscene to play.

Found this bug after messing around with controller. Found out some motion control tricks can be performed without motion control.

• Spin around by rotating left analog stick 2 full circles. You will do a spinning throw if you press X/Y at this point. You can also make him spinning on air too.
• Ground pound and immediately press X/Y when he landed, Mario will do a vertical throw
• Same as above but this time hold ZL and Mario will do a fast start rolling move (which probably make Sonic ashamed)
• Same as above but press A/B and Mario will do a lv 2 jump. The game will tell you about this though.
• Let Cappy hovering out by holding X/Y then dives into it with ZL * Y/X on air (the opposite button). Cover good distance but need practices. You can only do this once per normal jump
• This one is not a trick but I found it's funny. Just like triple jump, you can also do triple throw. It's actually just a standard throw but this time Mario spins 2 times, wahah!

By the way, just for a head start, learn all the moves. Post-game challenges are super hard and require good frame input and movement (those time trials are no jokes) to the point you have to be like a speedrunner.

P/S: Pardon me for my English. I didn't check other posts before posting mine so some of those tricks may already be well known...