Mismatched dates between the application form, the flight reservation and the hotel confirmation.
Names that do not match the passport exactly, including middle names and spelling.
Reservations that have already expired by the time the file is reviewed.
Insurance that does not meet the minimum medical cover for the destination.
Bank statements that are unstamped, incomplete, or show a sudden unexplained deposit.
Print everything, check it against the embassy checklist line by line, and keep a copy of what you submitted.
Build a verifiable reservation