Hurry up, else we'll be late.
You'd better leave now, else you'll miss the bus.
Do what I say, else there'll be trouble.
Such a funny movie.
"Someone else" sounds correct but else isn't trying to act as a conjunction there.
Scots (the Scots language, not Scottish English) tends to use bare "else" wherever "otherwise" is used in English, so I assume it's coming from the Northumbrian dialect of Middle English and leaks through to those dialects of Modern English with more Northumbrian influence.