The MIB ask for a 220V outlet to test Parker yet they plug the equipment into a standard 115V outlet.
The van with the nerve gas was to be positioned upwind of the White House so the wind would carry it in. In the climax, Parker is walking towards the van with the White House in the background. The White House flag clearly shows the wind blowing towards the van.
When the Russian commandos are boarding the freighter, supposedly on the open sea, you can see dock lights reflected in the still water.