...Okay, so I did find another place to do the glitch, right in 10-1, and it does involve pushing a box sideways while Rocky runs through Lolo. I didn't need it for my movie, though. Here's the finished version:
http://www.geocities.com/ryan_ferneau/lolo2-10.zip
I've picked up some new techniques that will probably make the next version faster, like that thing where I step halfway onto an egg before pushing it. It's also important to get an egg off the screen as fast as possible if the enemy is needed to regenerate elsewhere or if the egg is in water and another egg needs to be floated on water. That's why I was thinking of getting the other two magic shots in 3-5 before riding the first egg so I could shoot it off after reaching the island and ride the Snakey egg right away. I think it was either slower or impossible to dodge all the Skulls without magic shots afterward, though, but maybe I'll try harder next time.