The Valentine's Day card on the left in Dave Clifton's studio keeps changing the way it's facing.
In the interior shots of Alan and Jill in the car, there's a piece of apparatus attached to the dashboard in front of Alan (it appears to be some kind of screen, possibly there to block out the sight of other filming equipment)
Lynn says that she's picked up some brochures for the new Rover Metro. It was renamed as the Rover 100 in 1994, three years earlier.