Screwy shares her design, eye color, and sometimes cutie mark with S04E20 Unnamed Earth Mare #4, and she has a similar color scheme to Shoeshine, S01E14 Unnamed Unicorn Mare #3, and "Bloo". Screwy's debut in Read It and Weep was not part of the episode's script; both this first appearance and her appearance in Just for Sidekicks were added by storyboard artist Raven Molisee.