When talking with Gaad, Beeman says Karmak the Magnificent instead of Carnac the Magnificent, a character played by Johnny Carson on the Tonight Show.
When Paige calls home from the payphone, she puts the quarter in before picking up the receiver; payphones would not register payment until the receiver was lifted and a dial tone obtained.
Despite having Washington, D.C. registration plates, Nick's car has a NYS inspection sticker on the windshield.
When Paige and Henry are abandoned at the mall, they walk past Cozymel's Mexican Restaurant. Cozymel's wasn't created until the late-1990s and doesn't have a single location in Virginia, Maryland, or DC.
When the Rezident picks up his tea at the shop, as he turns to leave you see near the doorway either an alarm system keypad or a programmable digital thermostat of a type that did not exist in 1981.
The maroon-coloured German passport shown during the interrogation scene was modern edition issued from 2005. It had a rectangular gold-coloured symbol at the bottom of the front cover, indicating a RFID chip with biometric certificate.
The actual passport for use in 1981 had a green cover with pale green sheets and mug shot attached to the page by two brass ring rivets.
The actual passport for use in 1981 had a green cover with pale green sheets and mug shot attached to the page by two brass ring rivets.
When the kids are picked up in front of the mall, cars pass by equipped with a third brake light, which wasn't included in cars until 1986.
When the kids are picked up in front of the mall, cars pass by a blue Chrysler 1989 Lebaron convertible.
While Phillip is being kidnapped, a crew member is seen on the left-hand side of the door. Note: he was not a character or an extra.