Despite the gag of him being dubbed in English, James Hong actually provided English ADR work for Hong Kong film productions in the 1970s, including Exit the Dragon, Enter the Tiger; and Game of Death.
Three members of the cast starred in Batman films: Kim Basinger (Vicki Vale in Batman (1989)), Christopher Walken (Max Shreck in Batman Returns (1992)) and Drew Barrymore (Sugar in Batman Forever (1995)).
When Del is talking to a crowd in the donut shop, a waitress walks into the shot and stands next to Wayne. She then walks out behind him. In the next shot she is standing beside him again.
In the "returning home from England" plane scene, it's obviously a mirror image (identifiable by the writing on the plane being reversed.) However due to the nature of the jokes during the plane scenes, this was probably intentional.
When Wayne meets Bjergen Kjergen, we see alternating front and back shots of her. From the back, she is leaning to the side and her arms are crossed. From the front, she is leaning forward with her hands folded.