When Martin goes to look up the quote from exodus 22:22 in the bible, he actually reads the sentence next to 22:4. However, this quote makes sense to the story but doesn't compute with the tattoo of the killer.
'El Mozote' in El Salvador is mistakenly referred as 'El Mozole' by three characters.
When Martin Bohm sneaks into the chapel to look up Exodus 22:22, the zoom in shows he is reading Exodus 22:4. Exodus 22:1-3 are correctly reproduced in this "prop" Bible but 22:22 is moved to 22:4.