It gets worse because for NTSC colour they changed it to 59.94Hz so that the colour subcarrier could be an odd multiple of the scan rate and just fit into the 4MHz-wide channels.

This is why all your video editing software has got those ballachey 59.94/24.97 modes.

It gets worse because for telecine you need to need to show two frames of 24fps film for every three frames of video, so you need to slow your film down to 23.976fps so it fits.

Ballache.