When Mannix and the others are attempting to steal the payroll, there are two safe doors inside the lieutenant commander's office. They drill three holes in the left-side safe door for insertion of the explosive charges. After Mannix inserts the three charges, however, the view switches to a medium shot, and suddenly the three charges and the trailing ignition wires are inserted into the safe on the right-hand side, and there are no holes visible on the left-side safe door.
When the F-4 is making its high speed pass he can be heard coming even though he is supposedly going faster than the speed of sound. It wouldn't be possible to hear him coming, just the sound after the sonic boom.
With Joe's PI license suspended, his gun permit should also be suspended. His handgun would have been taken by the PD.