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In one particular scene, Harley Quinn and Poison Ivy have Barbara tied up in her room and a selection of posters can be seen in the background, scattered in typically student-like fashion across the wall. Along with the standard rockstars, Barbara's collection also includes several prominent Batman posters, foreshadowing her love of vigilante justice and iration for the Dark Knight. Slightly above and to the left, however, is a less obvious Batman Easter egg - the distinctive metallic Bat logo from Pattinson's Batsuit.

While Matt Reeves' reveal of the new Batman costume unveiled a number of notable details, by far the biggest talking point was the symbol, which appears to be constructed from the remains of the gun used to kill Bruce's parents. The detail is a cool, albeit slightly morbid, addition to the mythos of Batman, but also serves to create a very different Bat symbol than those seen previously. As a result, it's easy to pick out Bruce's latest insignia on Barbara's wall, and since the Commissioner's daughter is already a Batman fangirl, the poster blends in seamlessly with its surroundings.

It's interesting the Pattinson's Batman is already getting Easter eggs in the wider DC universe before the hero has even debuted in a trailer, and this is perhaps indicative of how quickly excitement is already building for The Batman. Quality Easter eggs such as this also confirm that Harley Quinn is one of the best DC TV shows to air in recent times, animated or otherwise, and is able to simultaneously pay homage to the world of DC, while also completely writing its own rules.

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Harley Quinn season 2 continues with "Riddler U" April 10th on DC Universe.