Here are just two examples where the rolls are letting down candidates and voters
In 1988, Joan Chambers lost her seat of Ballarat-South by 104 votes. From 1979 to 1982 the number of people on the electoral roll matched the numbers in the population census. In 1985 a discrepancy of 2000 people occurred. By the 1988 election there were around 5000 more names on the roll than in the census. After the election the investigation of one third of the roll found 1506 suspicious names and addresses, of which the Electoral Commissioner confirmed 1081 did not exist as eligible voters. They also found 106 people voted twice, 367 people voted who did not live in the electorate.
In the 1995, Queensland state election, the ALP's Ken Davies initially won the state seat of Mundingburra by just 16 votes. Later the Liberal Party candidate Frank Tanti uncovered some extensive cases of fraudulent alteration of the electoral roll.
Following a hearing by Judge Ambrose in the Court of Disputed Returns, November 1995, it was found that there had been significant faults made by the Electoral Commission officials, namely, people who were not residents and, therefore, ineligible to vote in that electorate had done so. It was also found that the votes of 22 soldiers serving in Rwanda had not been received before voting day. In light of this evidence the July 1995 result was overturned.
When most of the anomalies had been corrected, the By-election, in February 1996, was held and won by Tanti by 1084 votes, 1100 more than received in July ‘95. The loss of the one seat majority meant that the Goss government was replaced by a Liberal National Coalition government, led by Robert Borbidge.