You mean all of the flashing freeze frames or specific ones on your own car or on other objects?
I think all of them are jarring, especially because the game requires precise timing and not being able to see the current situation even for a moment will be lethal.
It's far too messy and too much "meh, can't do anything about it".
Yeah, designing levels for this game sounds hard, but there might be some other ways. Other cars could slightly move away from the player to add some error margin or shift the level design to be doable with player's current momentum and position (which would make it a more realistic interaction too).
I'm not sure what you mean with drift change sound?
As in the car making sound while player inputs direction change. It might be annoying though if done wrong. Right now the game has a a few clang-thing sound somewhere at the start of the stages and that's what made me think of it.