Question: After they escape the safe house, Weston calls the CIA and says "no chance of an SDR, I've picked up a tail." What does SDR stand for?
Answer: "Surveillance Detection Route." It's what you do when you think you're being followed (drive a specific route to detect if you're under surveillance or not). Weston says "I think I might have picked up a tail", so he was unsure if he was actually being followed or not, but had no time to try and determine if he actually is being tailed or not.
Answer: The movie doesn't appear to be set in a particular decade, probably to give it a more timeless appeal. Styles seem to range anywhere from mid-to late-20th century.
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