You're asking "how can I detect misspelled function names?", correct? Well, there's no easy way. As for why Perl doesn't do it automatically, that's because Perl lets you define functions at run-time, with eval() or AUTOLOAD().

eval 'sub foo { print @_ }';  # edited
foo(123);
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Edited, thanks to lestrrat.

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Jeff[japhy]Pinyan: Perl, regex, and perl hacker, who'd like a job (NYC-area)
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;