In that case note that enscript may have had a non-fatal termination:

 Enscript  returns  value 1 to the shell if any errors were encountere
+d.
       On successful termination, the return code is constructed from 
+the fol-
       lowing flags:

       0       no errors or warnings

       2       some lines were truncated or wrapped

       4       some characters were missing from the used fonts

       8       some characters were unprintable
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Note the On successful termination: Maybe some lines were truncated or some characters unprintable.