2020 Election Irregularities

General

Zuckerbucks
Chain of Custody
Signature Verification
Observers while counting ballots
Dominion voting machines
Distribution of applications for mail-in ballots
Electronic Voting Machines

Little voter fraud itself but other irregularities
Exceptions because of COVID
Other exceptions to state law.

By State

Pennsylvania
Table
https://www.naco.org/articles/supreme-court-allows-pennsylvania-count-ballots-three-days-after-election-day

Michigan
Table

Georgia
The judge's decision found that the Dominion election machines used by the government of Georgia could be manipulated to impact the election. The Judge, however, also said it was too close to the presidential election to do anything to stop the use of the machines. Thus, the election was conducted using voting machines known to have been corrupted so as to allow manipulations..
https://thefederalist.com/2023/09/11/georgia-grand-jury-report-exposes-fulton-county-prosecutor-as-an-election-integrity-denier/

Arizona
https://www.democracydocket.com/news-alerts/right-wing-group-files-new-arizona-election-lawsuit-after-withdrawing-from-maricopa-county/
America First Lawsuits
https://americafirstpolicy.com/issues/fact-sheet-state-election-integrity-scorecard-arizona
Also problems in 2022 election

Nevada
https://en.wikipedia.org/wiki/2020_United_States_presidential_election_in_Nevada

Michigan
Also 2022 https://www.msnbc.com/opinion/msnbc-opinion/trump-s-michigan-election-fraud-claims-actually-proved-true-sort-n1295741