When Kathy and Tommy enter Madame's house, a clock on a shelf says 1:30 pm. When they wait for Madame to return, a clock on the wall behind Kathy and Tommy says 3:30 pm.
Tommy runs in the sand out to the wrecked boat on the beach. Soon after, all 3 friends look at the boat, but Tommy's footprints in the sand are gone.
In 'Completion - 1994', as Tommy and Kathy walk to the garden gate, a VW Passat from at least 2001 drives past.
In one shot, Rodney's red Volvo Estate has an 'A' registration from 1983-84. In a later shot it has a 'G' registration, meaning it was manufactured in 1989-1990.
When Chrissie, Kathy, Rodney, Ruth, and Tommy look inside the travel bureau to see Ruth's possible, the computer monitors are clearly more modern than 1985.
When the girls are listening outside the classroom, the shadow of the camera's matte box is visible on bottom right of the wall as it moves down the hallway.
In an establishing shot of Miss Emily's house in 1994, a blue Citroen Saxo is parked outside the house. They were first sold in England in 1996.