Submarine and Deep End
There's one part in Submarine where the kid jumps into the deep end of the pool while clothed with a sign that says Deep End behind him. Obviously this movie was a big influence on Submarine, although since it hadn't had a proper DVD release when Submarine was made, I don't know how Aoyade watched it (bootleg copy?)
Here's my review (kinda) comparing the two: http://dasfilmblog.blogspot.com/2011/08/submarine.html