If a character cannot be selected, they will be grayed out, this being the "universally understood UI convention for nonclickability." If a character is meant to be selectable, but the pages aren't done yet, an informative (and, in Ms. Paint's case, apologetic) message will be shown. The first, second, third, and fifth time this message featured Andrew Hussie and the fourth time it featured Ms. Paint. These messages are still visible on completed screens, and can be reached by right-clicking the flash and pressing "play" a few times.