When Dan places the disc into the audio device in the opening scene you can see a brand name on the device (Telefunken). Later in the scene there's a close-up of the device and the brand name is taped over.
When the door opens after Rollin picks the deadbolt into the lab, you see there is actually no deadbolt.
As the IM crew was leaving the mansion after completing the mission, an American TV antenna (typical of the type used in the Los Angeles area at the time) could be seen on the roof. Foreign country TV standards are different.