Continuity mistake: Inspector Lebel's level of grey hair colour varies quite markedly back and forth during the movie.
Continuity mistake: When the Jackal is parking his car near the hotel, he parks in a small gap between two cars. When he gets out of his car, the leftmost car is gone.
Continuity mistake: The first time we see the beautiful Alfa Romeo Spider, the registration plate at the end of the car says GE1761, without a space between GE and 17. The next time we see the car, when he practices shooting in the the woods, the plate says GE 1761 with a huge space between GE and 17.
Continuity mistake: When the Jackal boards the train to go to the gun maker, the clock outside the station shows 11 o'clock. When he comes through the door, the overhead clock shows 9 o'clock. When he boards the train, an overhead clock shows 11 o'clock.
Continuity mistake: When the Jackal assembles the gun, to shoot the President, he puts the pieces on the table. Next shot the table is clear as he puts a chair on top to steady the gun.
Answer: Chins have sebaceous glands (natural oils). He rubs the key on his chin to lightly coat the metal key as a lubricant, so it does not stick to the mould. It will make a perfect impression in the mould to create a flawless cast.
Super Grover ★