Mare Do Well posters set up around Ponyville are in the same style as Batman: The Animated Series; additionally, the background music later in the episode during a chase references Danny Elfman's theme for the series and movie.
The scene where Rainbow Dash is chasing after Mare Do Well has Mare Do Well running by in the foreground, Rainbow rushing where she saw her, Mare Do Well running by in the background, Rainbow running over there, Mare Do Well running by in the foreground, and so on.