2dee498d train 0 input breaks the pattern
it seems to me that 2dee498d train 0 input is inconsistent with the other inputs of this task.
train 1, train 2, and test 0 consist of a simple 1x3 tiling of the output. The central block of 1x3 tiling of train 0 is reversed, thus breaking the pattern across the inputs.

Sorry for being a slowpoke/off-topic -- could you please share the tool you used to make this tables?
@jmmcd sure, it is in this rejected PR: https://github.com/fchollet/ARC/pull/12 although I have made a few improvement to the CSS since
Agree. You could however also argue that the task is merely to extract the left-most or right-most 'block'.
I'd say this is an exceptionally realistic pattern. Real world patterns are seldom perfectly matched.