The use of HTTP instead of HTTPS is crucial to ensure security and avoid errors, as some APIs may redirect HTTP traffic to their HTTPS counterpart, but not all frameworks will follow a 302 status code. Outdated caching can lead to issues, such as the presentation of new data before it's fully cached, causing 404 pages when clicked. Unexpected error codes can occur due to insufficient information provided by API providers, and using the wrong HTTP method can cause problems with request-body requests. Sending invalid authorization credentials is also a common mistake, which can be avoided by paying attention to syntax and grammar in header values. Not specifying Content-Type or Accept headers can lead to errors, as some APIs may return 403 errors if these headers are not included. Additionally, APIs returning invalid content type when there is an error can cause issues, and failure in team communication can lead to a cascade of errors and damage control.