You could also play PAL on 60Hz in the US with the right equipment. However, playing the video system on the opposite mains always had a weird flicker in the playback as the native power and playback just didn't line up.
It is similar to the effect that could be seen when using native lighting in a 50Hz mains country while recording video in NTSC. Not everyone would notice, but when you sit in an edit bay working with that footage all day, you notice everything.
Then again, some people don't notice the stuttering that is the result from 24->29.97 either. The modern 4th frame repeat drives me up the wall. </rant>
It is similar to the effect that could be seen when using native lighting in a 50Hz mains country while recording video in NTSC. Not everyone would notice, but when you sit in an edit bay working with that footage all day, you notice everything.
Then again, some people don't notice the stuttering that is the result from 24->29.97 either. The modern 4th frame repeat drives me up the wall. </rant>