The film is set in 1997. There is a scene where Amelie knocks on a house door and in the background is a new model VW Beetle. These weren't available until early 1998. You can also see several scenes with various new models of Fiat Punto and VW Golf which weren't available until 1999.
Amelie is shot in two main thematic colours: red and green, which vary according to situations and moods. Watch it again with that in mind.