The name of the chemical company (INTEROCO) is spelled in "Gellerese with the "N" being reversed; however, the fake ID cards with Phelps' and Carlin's picture on it has it spelled as "INTEROCO" (the "N" not being reversed)
When the guard gets the fake ID cards, it is clearly Carlin's card on the top in the long shot but Phelp's card on the top in the close up.
In the printout of Dr. Carlin's information the word "knowledge" is misspelled as "knowlege"
As Dana is driving up for there meeting with Dr. Vazan, a gray metal wall can be seen attached to the underside of the vehicle. It can also be heard scrapping along the pavement, yet, somehow the guard driving in the car
with Dana, does not hear it.
Dr. Vazan is rendered unconscious by a drugged spike on Ms. Lambert's ring. The spike, however, isn't long enough to penetrate Dr. Vazan's collar where Ms. Lambert applied it.
At the end, as the IMF team exits the building with Barney being supported by Doug and Willie and moves to the van, they are undetected though the exterior of the facility is supposedly heavily guarded. But as the van starts to drive away, a multitude of guards quickly appear and begin firing.
When they go into a room with the door labeled 'FURNACE', the N is backwards.
When Jim and Carlin enter the lab with the chimpanzee's as the camera pulls back, you briefly see a person standing on the right side of the frame.