Once you have written your screenplay, make sure you keep the reader hooked by eliminating all the errors that would distract from an enjoyable experience.
Check this 12p. list of errors and annoyances to perfect your spec screenplay.
Karel Segers wrote his first produced screenplay at age 17. Today he is a story analyst with experience in acquisition, development and production. He has trained students worldwide, and worked with half a dozen Academy Award nominees. Karel speaks more European languages than you have fingers on your left hand, which he is still trying to find a use for in his hometown of Sydney, Australia. The languages, not the fingers.