Miscellaneous Movie Musings

[Alex]

I've always understood that jump cut was always there (though I didn't see it when it was first released like you did) and that it was simply a necessity when they were forced to edit two master shots together.

They're not completely uncommon in the old dance musicals where video monitors weren't available to immediately spot a lot of issues only to be found later and the nature of the long master shots used in dance numbers made unexpected editing difficult (in a modern movie, who'd notice?).