During the firefight outside the tunnel entrance, the entire firefight appears to take place in fine weather and all of the vehicles, both in and out of the tunnel are dry - except for in the closer shots where Hannah exits one of the SUVs and moves toward the convoy, where the vehicles behind her are clearly streaked with rain (and it looks as if it is raining in the background), suggesting that those were filmed separately, after a change in the weather.
The police convoy transporting the gold is traveling westbound on H-3 freeway and is attacked exiting the westbound tunnel. When Hannah steals the truck carrying the gold she continues driving westbound, yet the ensuing fight and crash somehow take place just outside the eastbound tunnel exit.
When Rick is told where Magnum's Ferrari was picked up he is told it was found "off 72" (referring to Route 72, Kalanianaole Highway near the Robin Masters compound in Waimanalo.) In Hawaii, locally raised people do not use route or exit numbers when talking except when referring to the three interstate freeways H-1, H-2 and H-3.
Magnum falls off the van while it is speeding to 100 km/h, and is severely injured, but survives. At such speed, he surely would have been killed.