Ice Missiles

You can get ice missiles before grapple swing by obtaining the Bryyo map without Grapple Swing. This is primarily useful in 100% as it means you can get the missile tank near grapple swing behind the ice missile door without making a detour later.

Crash Site

Clear out the enemies in this room. Morph, then roll towards the grapple point until the two walls end. Spring ball behind one of the walls, then unmorph and do a BSJ. At the peak of your jump, jump through the grapple point; the game will spawn you on top of the glass ceiling automatically and you can proceed to get the Bryyo map.

To go across the other direction after obtaining the map, you can either do the morph ball puzzle to get on top of the glass ceiling like normal, or use a ghetto jump off of the slight slant at the very ledge of the bottom floor and touch the grapple point again; this will spawn you on top of the glass ceiling and you can jump across (this is faster than going through the intended morph ball tunnels).

Seeker Missiles