Suicide Squad: 30 Easter Eggs & References You Must See
25. Joker And Harley Quinn’s Alex Ross And Paul Dini Homage
During one of Harley Quinn's first flashback sequences (which is very possibly just a fantasy shot meant to explain their relationship), we see her in her iconic harlequin costume from the original cartoon that gave birth to her.
We also see her and the Joker bathed in darkness dancing - him in a tuxedo and her in her harlequin garb - recapturing perfectly the cover of Paul Dini’s Batman: Harley Quinn, as illustrated by the genius Alex Ross.
As fan service goes, it's a great moment.