Regarding the ZFW - stanard procedure would be to input the PLANNED ZFW and this would be shown on the CFP, when the load sheet arrived any adjustment required would be made.
The figure shown on the CFP was usually very close and any MAJOR change would have been passed to the crew in case they wanted to change the fuel load.
The pax load is well known beforehand and varies little, the cargo load can vary a lot if it was not fully ready etc. etc. and a pallet left off, such changes would be notified to load control and when the load sheet was given to the captain it would show the final, and if necessary, revised figure, this figure would also probably have already been passed to the aircraft via the company frequency, the captain would then input the revised figure.
An incorrectly insertwd ZFW figure of, say, 90K should have thrown up a number of alerts including unrealistic V speeds and trim setting.