Errors happen and we rely on the folks who use the spreadsheet to help us catch things that are erroneous, out of date, or broken.
For some errors, such as date errors, it is super useful to include a link/source showing the corrected information. Some errors occur when there is conflicting information and, in those cases, we like connecting with departments to let them know there are conflicts or unclear information.
NB: information for the 2021-2022 application cycle is not yet updated! It is likely that many dates will be wrong until we do a formal update starting in July and continuing into August/September as programs update their deadlines.