On Atlantis level 28 I found a very interesting glitch that could save some time. It involves activating a button without the button making any indication that it was pressed. Here's a video to see what I mean:

Not sure if this will save any time or if this has already been discovered, but I figured I should share just in case.

It might save a few split seconds but nothing more then that. You also can't ignore the button, you must still go down and touch it, even though the graphics thinks you haven't, so it wont save much time.

I always do it, it actually is a bit faster and easy to reproduce.