I have recently picked up an excellent history of Surealism and Dada book, and one of the main protagonists is Max ernst. Here is a documentray in two parts about him and his realtion to Surrealism.
I ws talking to Mark (not postie Mark) about Dada and Surrealism and he pointed me to this Hans Richter classic. It reminds me a bit of Brion Gysin's Dream Machine.