Obvious double for Humphrey Bogart in the fight scenes and the street scenes filmed in Japan.
As Bogart walks in front of a bus, it loses its large left hand driver's mirror.
When Joe is received by Anya at her birthday party, he is holding the gift box in front of him. The next shot shows him holding the box under his arm.
When Joe fights with Kanda to liberate Anya, she sits on the bed twice.
When Joe begins to fight with Ito, he takes off his coat and gives it to Kanda, who holds it with his right hand. In the next shot, Kanda has nothing in his hand.
The shoulder patch on Capt. Winnow's (Whit Bissell) jacket is clearly from the China/Burma/India theater of WW II. No U.S. military serving in Japan would use such an insignia.
Walking up to Cabaret Tokyo Joe, the door is open but Bogey opens it anyway.