American Accent Training (a book that should help who speaks English as second language with the pronunciation of American English) says that L is pronounced differently at the end of a word. Listening to the pronunciation of words with a final L given from the OALD running on my computer, I don't see any difference.
What is exactly the difference between pronouncing the L at the beginning of a word, and at the end of a word?
The book shows the following words, for explaining the pronunciation of the final L.
A hole hold hone hoed
call called con cod
B fill full fool fail
fell feel fuel furl
Similarly, it shows the following words for explaining the pronunciation of the middle L.
belly Benny Betty
caller Conner cotter
alley Annie's at ease