Check your bid bonds, then check them again–especially if you are bidding on multiple procurements at the same time.
That’s the lesson to be learned from a recent GAO bid protest decision, in which a contractor’s bid was rejected because its bid bond referenced the wrong solicitation number and bid opening date. Reading between the lines, it seems that a simple mistake occurred, confusing the solicitation with another procurement. But assuming that to be the case, the simple mistake (and the contractor’s failure to catch it) cost the contractor an award.