Slide to Get Under TNT Boxes
More than a couple of times in Crash 4, you'll encounter a stack of boxes that has a Box on the ground with a TNT on top. The normal method to get the Box on the bottom is to stand still next to the stack and Spin, where Crash and Coco use a "Low Spin" move.
But there is a better way! Their Slide move is actually quick enough that you can smash the lower Box and slip right under the TNT without hitting it! To Slide, press the Crouch Button while moving. Give it a try, you might find it easier!