Here are 2 prototypes for Surf's Up. The first is 4K and the second is 8K - both are different from the 8K prototype version that's been available for years (check out Atarimania.com to d/l that version). Both of these are earlier versions, as neither game can be started (pressing the fire button "resets" the waves).
Surf's Up prototypes
Jerry also had alternate versions of Atari's Defender and Missile Command.
The version of Defender is very interesting. Instead of showing "(c) 1982 ATARI" on the screen at startup, it shows "DEFENDER". Also, Bob Polaro's hidden initials ("BP") were replaced with "HA".
The version of Missile Command is the one w/o Rob Fulop's initials hidden in them, but it's not the same byte-for-byte as that released version.