When the Wonder Twins are kidnapped, they are wearing their pajamas and even are first seen wearing them when first trapped in the cavern. When Batman and Robin rescue them, they now have on their normal costumes.
Hawkman's size changes quite a bit when he's in the giant's castle.
When Hawkman is trapped in "Jack And The Beanstalk", his "mother" recognizes him as Jack when she yells at him for buying the five beans. Later, at the giant's castle, the giant refers to Hawkman as a talking hawk when he's about to cook him.
When Batman and Robin rescue Superman from "Gulliver's Travels", Batman uses his Bat Strait Jacket to hold Sinestro with Sinestro never thinking to use his power ring to escape.
When Green Lantern rescues Wonder Woman from "Alice And Wonderland", he uses his ring to encase Giganta in a bottle. Giganta never decides to make herself into a giant to break out of it.
When the Wonder Twins are captured and put into a cavern that is flooding with water, they are both tied up together, back to back, touching each other. Neither of them think to use their Exxor powers to change into something that would free them.