A firm in financial difficulties:
People in the accounts department leaving for other jobs - especially if they haven't worked there long enough to qualify for redundancy.
Managers and supervisors leaving and not being replaced, with their workload shared out among other staff with no increase in pay to match the increased responsibility.
In shops - a marked decrease in the amount of stock for sale on the shelves, and regular deliveries being fewer and further between.
Stressed-out bosses taking their annoyances out on the workforce.
Long-serving members of staff being encouraged to take early retirement.
New staff members being let go before the end of their probationary period. Permanant staff not being replaced by other permanent staff with a proper contract, but by zero-hours temp staff instead.
A lot of incoming phone calls asking for 'accounts payable', which is usually a sign that bills are not being paid on time.
Getting the sack:
Well that could be anything really.