Some events act slower or faster in the PAL version. For instance, the countdown on TNT crates is faster, but Ripper Roo jumps slower.
The Lost City
At the very beginning of the level, two Crates can be found behind an iron crate stack. In NTSC-U/C, it's impossible to jump over it because it's 3-crates tall, and Crash can only jump as high as 2 crates. For some reason, it's actually possible in the PAL version to jump over it from the right (and, even more oddly, not from the left).