Corrected entry: When Angier and Cutter show the machine to Ackerman in the abandoned theater, it is shown that, after Angier enters the machine, he completely disappears. No duplicate is left behind. Since it is not a completed scenario, there is no trap door for a duplicate to fall in. He is seen disappearing, leaving none behind, and appearing at the other side of the theater to Ackerman's surprise. However, in the end of the movie it is revealed that this machine never disappeared anybody, it just created duplicates at a certain distance. So why didn't a duplicate remain in the machine when they showed it to Ackerman? And if the reason is that they could fix it, so a duplicate wouldn't remain, then why would they still create duplicates for the rest of the film? This little scene breaks all the logic of the film.
Corrected entry: Olivia brings Angier the notebook of Borden and Angier realizes, that it is encoded. "Even with the keyword it would take months to decode it." Furthermore, he admits to Allie in the Colorado Springs restaurant that the cypher changes with each day and is "time consuming to translate". However, after Angier received the keyword ("TESLA"), he can be seen several times reading the notebook casually as if he already decoded the whole book. Nevertheless he reacts surprised as if he has never seen the entries when he should have, namely WHILE DECODING the book. Particularly, in the last entry, Borden directly addresses Angier, telling him directly that he lured him to America on a wild goose chase. The moment Angier would have deciphered this, he would have the reaction he shows and not only after setting all the entries in a context whatsoever. The book he reads is actually the original notebook from Borden, not the one he uses to transcribe the translation, which is smaller.
Corrected entry: When Angier asks Nikola Tesla to make him a machine for his magic act, Tesla makes a machine that can exactly duplicate human beings, down to their memories. Why would Nikola Tesla sell this machine to a lowly magician when it could be sold to his government for colossal amounts of money?
Corrected entry: When Robert performs his 100 shows with his magic trick, he (or his clone) dies in the water tank and the other shows himself to the public above the audience. But when Alfred is backstage and tries to save Robert, the 'other Robert' does not show himself to the public. How does this person know there were troubles backstage? When the trick goes correctly, he shows up within seconds. At that point there wouldn't be enough of a commotion from backstage to tell him their plan had been carried out.
Corrected entry: When Angier is shocked by Tesla's fence and falls down, his watch falls out of his pocket, but in the next shot it's back in.
Corrected entry: If Alfred's twin was produced by Tesla's machine, Alfred would have understood Danton's trick immediately and had no need to sneak back stage and fall for the set up.
Corrected entry: The use of Angier and Borden as plants for the water tank trick at the beginning makes no sense; they never wear any kind of disguise (except changing their clothes), so all it would take for the technique of the trick to become known would be for someone to see the show more than once, which would doubtless happen at some point.
Corrected entry: Robert Angier's real surname is Caldlow, but he's married publicly to his wife Julia under his surname of Angier. Later on in the film after Julia's death, when Angier meets up with Cutter and Cutter explains why he can't get any work, Cutter says that nobody wants to hire the man "who killed Julia MacMillan on stage". Wouldn't she have been Julia Angier at that point?
Corrected entry: The box used to drown Angier's clone has glass sides, but they serve no purpose, other than to reveal for the camera what is happening inside.