By the time Adventure Comics #365 rolled around, the Legion was getting pretty large, so the powers that be decided it would be easier to fill those blank pages with illustrative pictures (as opposed to stories with plots, dialogue and characterization). Here are some highlights:
If you work in construction and a beam is about to fall on you, Lightning Lad will apparently electrify the beam first to make sure you are good and dead so you don't have to worry about the high cost of medical treatment.
One of Cosmic Boy's lesser-known powers seems to be the ability to generate tumbleweeds, which he likes to launch into busy intersections.
Um.... I don't care how light the tree is, unless something is affirmatively pulling it in the opposite direction, those roots are gonna keep it in the ground. See "How a Balloon String Works" by any Child Above the Age of Three.
Few people know that the ability to make objects heavier also constitutes an immunity to fire. Because it doesn't. Check your local comic shop for the Star Boy Visits the Local Burn Ward mini-series.
You may recall Element Lad's origin story. He is the last survivor of a race of people who could change one element to another. They were wiped out because they refused to convert common elements to precious ones. Here we see Element Lad converting common elements to precious ones. I guess the principles don't apply when you are making yourself rich.