The document summarizes common security mistakes related to electronic voting. It describes issues such as voting machines lacking security features to detect tampering, failure to thoroughly inspect machines for hardware or software tampering before and after elections, overconfidence in tamper-indicating seals which can be subtly spoofed, and inadequate training of personnel on properly inspecting seals. The document provides recommendations from Argonne National Laboratory's Vulnerability Assessment Team to address these issues through measures such as randomly inspecting a percentage of machines before and after elections, improving procedures for inspecting tamper-indicating seals, and implementing stronger protocols for locks and access controls.