在《小丑2:雙重瘋狂》（Joker: Folie à Deux）的電影預告中，有許多彩蛋。影片一開始的雨傘顏色與小丑的穿著相符，有紅色、黃色、橘色和藍色。相似接著是小丑與哈莉奎跳舞的畫面，這是向漫畫家Alex Ross的油畫致敬，在自殺小隊的電影中也有出現此場景。當小丑與小丑女舉行婚禮時，首部電影中逃過一劫的侏儒同事將擔任伴郎。此外，Lady Gaga將出現在小丑曾經跳舞的階梯上，並做出開槍的手勢，表示她與小丑一樣面對高譚市居民的極度不友善。而片名中的「雙重幻想」也預告著，觀眾將透過小丑和小丑女的視角看到現實與幻想中的兩個高譚市。

In the trailer for "Joker 2: Folie à Deux," there are many Easter eggs. The colors of the umbrellas at the beginning of the film match the attire of the Joker, with red, yellow, orange, and blue umbrellas. Similarly, there's a scene of Joker dancing with Harley Quinn, paying homage to the oil paintings by comic artist Alex Ross, which were also featured in the Suicide Squad movie. During the wedding of Joker and Harley Quinn, the dwarf colleague who narrowly escaped in the first film will serve as the best man. Additionally, Lady Gaga will appear on the stairs where Joker once danced, mimicking the gesture of firing a gun, indicating that she, like Joker, faces extreme hostility from the residents of Gotham City. The title "Folie à Deux" hints at the dual fantasy, suggesting that viewers will see two versions of Gotham City through the perspectives of Joker and Harley Quinn, one rooted in reality and the other in fantasy.

照片:電影官網