I've found the following minor indexing incompatibility:
A = ones(2, 3, 4);
B = A(1,:)
gives
ans =
1 1 1 1 1 1 1 1 1 1 1 1
as expected in both Octave and Matlab. However,
B = A(1,1:end)
gives the same in Matlab, as expected, but
ans =
1 1 1
in Octave (current hg default branch).
Cheers,
Moritz