Other mistake: In the scene where Paolo leaves the stage after everyone discovers that he can't sing, his bodyguard Serge stops him and Paolo suddenly loses his Italian accent. Paolo sounds very American when he says "You work for me, Serge."
Other mistake: After the concert, when Dewey is telling Gordon how awesome the lights were, Eleni calls him Jack. The actor that plays Dewey is Jack Black. (This mistake is mentioned in the Kids Kommentary [sic].) (01:35:40)
Other mistake: When it shows the railroad, there are no horizontal bars.
Other mistake: Whenever Jackie uses a tattoo gun, particularly in the scene where she's tattooing Faith, the camera angles make it obvious that the needle isn't moving.