Corrected entry: When the elevators break down, since they never existed, wouldn't everyone mentally forget about elevators?
Corrected entry: When Leopold comes to the future the elevators stop working correctly (JJ makes a comment about moving his office to the ground floor due to the malfunctions, people are taking the stairs), yet Kate gets in the elevator near the end of the movie without even thinking about it.
Corrected entry: In the movie, Leopold's last name is 'Mountbatten'. This is impossible, since the original name - 'Battenberg' - was only changed in 1917 by the British Royal Family, into 'Mountbatten'. This is the result of anti-German feelings during the First World War. Consequently, Leopold's last name should have been 'Battenberg', not 'Mountbatten'.
Corrected entry: In the movie the point is made that it is time travel, meaning that you will end up at the same place, just at a different time. So if you jump off a bridge ending up in a different time, you should still fall into the water and not on dry land.
Corrected entry: At the very beginning credits where they are showing the bridge it is very obviously a backdrop. Look closely and you can see the towers with smoke, and the smoke stays still the whole time. (00:00:55)
Corrected entry: In the opening bridge scene the spectators are waiving 49 star flags in 1876. (00:00:50)
Corrected entry: Kate's ex-boyfriend has a bad fall down an elevator shaft, because ostensibly time has been altered and Leopold doesn't invent the elevator. But if that's the case, why would the sliding doors to the elevator even be there in the absence of the device they were installed for? He would have just walked into a blank wall.
Corrected entry: At the end of the movie, when Leopold comes back to the past, he returns to the same day but earlier in time (we see him going upstairs to prepare for the evening party). Shouldn't he have encounted his earlier self, the Leopold who will later chase Stuart and travel to the present, as was shown in the beginning of the movie?
Corrected entry: When all the elevators disappeared, the NY City skyline should have changed also. Surely nobody would build office buildings much higher than 10 stories (the 1890 record) if workers had to walk all the way to the top every day.
Corrected entry: When Stuart falls down the elevator shaft, the sliding doors to the elevator open when the car was stopped below. Elevator doors are designed to not open unless the car is at that floor or forced open.
Corrected entry: Towards the end of the film, when Leopold has already gone back to the past, they show the pictures that Stewart took. Kate is in one of them. But Kate didn't arrive in the past till the point where Leopold is announcing his new wife, and he does this after Stewart left, so there is no way Kate could have been in the picture.