In one of the first sequence you can see slightly blurred in the background the logo LCL (yellow letters on a blue background) of the Crédit Lyonnais bank. The LCL name/logo was only introduced around 2005 and there did not exist yet in 1984.
(At around 20 min.) In Manu's trailer, Adrien has a glass that seems to be half full of red wine, with the bottle apparently about 1/3 full of red wine next to him. When he pours himself a refill, what comes out is clearly water.