Other mistake: The Italian version of the movie keeps the "All the good ones end in -O!" joke that singles Raphael out, making him angry and causing his punishment...but the Italian names of the Turtles ALL end in O, "Raffaello" included. (00:31:05)
Sammo
Other mistake: During their computer hijinks, Leo asks Don "Can you bring up the file?", which the Italian dub mistranslates in a nonsensical "Can you block the file." (00:25:30)
Other mistake: In the TGRI building, the whole computer scene is the kind of nonsense you can expect from something really 90s and childish. Forgetting the fact that Donatello's big fingers are obviously too big to push the keys, the database screen scrolls independently from his movement, and when he tries to "decode" the database, whatever it means, he just types back the serial number. It's all just waving hands around to make it look like you're doing something. (00:25:05)