The end credits have Basil Moss playing Dr. Harris instead of Dr. Frazier, and Peter Burton playing "Perry" instead of Dr. Murray.
When Foster enters the sauna room, Franklin warns him that it is a "sonar bath". This pronunciation of sauna is incorrect in both English ("sore-nah") and the original Finnish ("s-ow-nah").
The reflection of a crew member's face can be seen in the side window of Foster's car as he's getting out at the Research Center.