In the scene where the two Amitabh twins meet, the actor playing Amitabh's twin seems to be wearing a black/white check shirt, while Amitabh (when playing the same character) is clearly wearing a black/white wave pattern.
The casino booklet that Vijay receives has the instruction to go to the toilet, but there is a spelling and grammar error. The instructions says, "Go to sixth floor toilette".
The car that Jai and Mala use has a registration based in the Netherlands (with the short-hand NL) although they are based in Venice/Italy. In this scene however, it is shown that they were in the Netherlands.
Jai and Mala are shown in an airport in Italy (Jai was using a telephone booth with Italian text), however when both come out, they are shown to be driving a car with vehicle registration from the Netherlands (denoted with NL), which shows that they were in the Netherlands.