After Linda was hit by the car, Martin/Moritz runs towards her wearing a completely clean t-shirt. A second later when he gets down to her it's covered in blood before he even touches her.
An airliner is seen landing. It is clearly an Airbus A320. This aircraft type only took its first flight in 1987.
Stamm tells Tischbier that Linda has run away - he had no idea where she had gone, yet Tischbier just happens to be driving down the forest track at the exact time Linda is on the same piece of road. She only ran into the forest when she saw Stamm chasing her so Tischbier had no way of anticipating she would be there.