Deleted scenes: Fact or fiction? (Possible Spoilers)

[Verisimilitude1984]

My thanks to member JackForrester, because his avatar image from Jaws started the idea of this thread for me and his explanation of it.

I just find this subject really fascinating and I want to learn more. Perhaps I've overlooked some of these in the 'Extras', however are there actual deleted scenes to our favourite films that only exist in trailers or lost stills. Have some deleted scenes never been released? Are some of them just urban myth?

Jaws (1975)

An unused still for the Kintner boy's death (was this even filmed?)



The death of the rower in the pond seemed to be more violent, as he was carried in the mouth of the shark.



The Exorcist III: Legion (1990)

The infamous head morph by the Gemini killer, shown briefly only in the trailer.



Deleted scene of the death of the first priest. Spoilers as might be upsetting to some.

[Show spoiler]

Aliens (1986)

Burke found cocooned by Ripley.



The Empire Strikes Back (1980)

Another kissing scene between Luke and Leia.