  We analyze the imprint of nodal planes in high-order harmonic spectra from
aligned diatomic molecules in intense laser fields whose components exhibit
orthogonal polarizations. We show that the typical suppression in the spectra
associated to nodal planes is distorted, and that this distortion can be
employed to map the electron's angle of return to its parent ion. This
investigation is performed semi-analytically at the single-molecule response
and single-active orbital level, using the strong-field approximation and the
steepest descent method. We show that the velocity form of the dipole operator
is superior to the length form in providing information about this distortion.
However, both forms introduce artifacts that are absent in the actual
momentum-space wavefunction. Furthermore, elliptically polarized fields lead to
larger distortions in comparison to two-color orthogonally polarized fields.
These features are investigated in detail for $\mathrm{O}_2$, whose highest
occupied molecular orbital provides two orthogonal nodal planes.
