Initially when soldier sees the figure watching him from outside his car ( later revealed as himself in an inter dimensional time loop) there is no alley behind the figure. Late into the film, upon exiting the sewer, Soldier is watching himself from a dark alley.
At one point, a box of VHS tapes are revealed, even though those were released in 1976.
At one point, there is a modern cassette recorder, even though that model is most definitely from the 1990s.
While Scout is being tortured, there is an apparatus shown that is seemingly made from the joystick of an Atari 2600, even though that console wasn't released until 1977.