Technically this article should be titled "15 types of mistakes..." because a list like this is always about generalization. But hey, precision is a lost art. Anyway, the list provided here is based on a "survey of 8,392 undergraduate students from 54 institutions across the United States," and I would classify the items more as "unpopular choices" rather than "mistakes". For example, the first one mentioned is "the use of unofficial platforms and too many external applications or sites." That's actually two things (again - precision, right?) and while I can understand the problem with "too many" applications, who cares whether the platform chosen is 'unofficial'? Other 'mistakes' aren't original to the pandemic, such as "use of long lectures with massive slide decks." And "belittling students with disabilities" isn't merely a mistake, it's a much more serious problem.