At the beginning, when Kenji Ryu and Eddie are seen on the boat heading to New York, Kenji is wearing a coat over a black T-shirt, but in the very next shot, the coat is gone and he's wearing only the T-shirt.
When Kenji and Eddie are standing outside the gym, after the boxing match with Gordon, Kenji's clothes change from a t-shirt and jeans to boxing shorts and gloves to a t-shirt and jeans again between shots.
During the boxing match between Kenji and Gordon, Kenji is suddenly no longer wearing boxing gloves when King starts the countdown for Gordon.
Kenji's height keeps changing throughout the OVA.