Yes agreed, I'm trying to wrack my brain as to the make and model, as it seems a common car back in 70's to see old cars that had a Backwards slope to the rear window.
Something like the old BMW 1500, Renault 12's, Totoya Carona T40, Ford Cortina Mk1, but the tail lights are not the round like the Cortina's nor the small like the BMW's and the bumper isn't the Renault's nor the Toyota's. And it's definitely not got the rounded lines of an old Ford Anglia 105E, Morris, Austin or Rover.
Maybe it's an image blur? because after 1970 I don't think there were many cars with backwards sloping windows any more.
The rubber inside the bumper rules out a Gemini TD as their bumpers were solid chrome. However the bumper does fit the Gemini TE's bumper, tail light set up and plate position. And if someone put the side strip high up on the body, it could like like the car in the driveway.
https://upload.wikimedia.org/wikipe...px-1979-1982_Holden_TE_Gemini_SL_sedan_01.jpg