In the opening scene when Gene, Sam, Chris and Ray are walking toward the body, you can see a Direcway dish mounted on the wall on the building behind them. Satellite Internet technology wasn't invented for another 20 years.
The surveillance scene depicts a full-size GMC/Chevy van with square sealed-beam headlights. This would make it a late '70s or early '80s model. Square headlights were not found on US-made vehicles in 1973; they were not allowed until 1975.