Chan Park Wook stated on his solo DVD commentary that there is an edited version of Oldboy for television broadcast. It omits some of the more extreme violence and the love scene between Oh Dae Su and Mido.
Prior to the DVD release, some changes to audio were made. The most prominent is the beginning, where the initial music was being extended to the production logos. Those alternations are likely to be undone in the 10th anniversary remaster, as the director Park Chan-Wook claimed to "have changed nothing from the original film."