Factual error: 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.
Continuity mistake: When Nino goes to 'Les deux Moulins' for the first time, we can see Amelie writing the menu on a glass right behind him. A few shots later, we see the glass again and the handwriting is quite different. That's easy to see if you look carefully at the 'd'. Later on, we see the glass once more, and the handwriting has changed again.
Revealing mistake: In the part where Amelie gave back the photo album to the bloke in the fun park, when he finally gets to his bike, you can see people in the background staring intently at the filming.
Visible crew/equipment: Just after Amelie picks up Nino's dropped album, in the shot when she is sitting on some steps looking through it, the shadow of the camera crane is visible on the ground behind her. It is only seen when the camera moves over her to let us look into the album.
Continuity mistake: Before Dominique Bredoteau enters the phonebooth he has a bag in his left hand. When the camera angle changes he transfers it to his right hand as his arms suggest. When he replaces the handset he swaps the bag back to his left hand picking up the tin box with one hand. The camera cuts to an overhead shot of him holding the tin box with both hands not allowing enough time for him to put the bag down.