Four examples of problematic spectra with special features that can significantly influence automated classification (see text). Emission lines are labelled at the top, absorption lines at the bottom. The vertical green lines in the spectra plots mark the positions of the Ly α line for the redshift from the SDSS. The blue squares indicate fluxes derived from SDSS photometry. The image of J011118 is from the SDSS; all others are from the LS (15 arcsec side length).