The document outlines five common mistakes employers make when filing H-1B petitions for the 2020 cap, including deficient job descriptions, mismatched FEINs, improperly determining previous H-1B status, incorrect start dates on Form I-129, and incorrect filing fees or addresses. It emphasizes the importance of careful preparation to avoid these pitfalls to ensure successful adjudication of petitions. Additionally, the document promotes VisaPro's consultation services to help improve H-1B filing strategies.