The US theatrical and the UK Sky Cinema cuts differ in roughly five minutes. Most of this is allegedly attributed to the US version running at a lower frame rate, with the only real notable difference being the use of "Gangnam Style" in the UK version and a different song in the US. It's widely theorized that the change was due to being dated, as the peak of the "Gangnam Style" popularity was in the mid 2010s when "Blazing Samurai" was in production. Regardless, the song is still in the US end credits.