At around 1:32 in Bobo's run, there's a section with a bottom spring on a block, which he bounces off of and then does a bottom corner boost on spikes to the right. I've managed to do a faster strat, using a corner boost on the spring block, grabbing the spring, throwing it, and bouncing off of it midair and then continuing with the same path that Bobo took. It saved me more time due to less air time after bouncing off of the spring.

At the beginning of the third chapter, there is the section with the floating blocks. It is quite precise, but it is possible to do 5 consecutive corner boost and make it faster than the wr holder.