When the first bad guy stabs Casey's supposed corpse with a pin, the action is an homage to a similar scene in "Charade," although in the latter the man in the coffin is indeed dead. The romantic couple/spies in the church observing the sequence in shock here are Chuck and Sarah, with similar roles played by Audrey Hepburn and Cary Grant in "Charade."
The trivia item below may give away important plot points.
In the dessert bunker Morgan saves the day and also takes 10,000 volts. Hollywood almost always gets this wrong. Voltage means nothing by itself; house current will fry you at 110 volts, but first generation stun guns would merely inconvenience you at 25,000 volts (current models run at millions of volts). The bunker would have run on 220 volts at most. It is the amperage that kills; one amp can stop your heart. Look at the fuses or circuit breakers in your home and you will see your wiring maxes out at 15, maybe 25 amps. Stun guns generally run at less than 0.004 amps.