Near the end when West walks into the mansion where the meeting is being held, just as he enters, Lt. Armand Renard can be seen talking to Artemus at the bottom of the staircase ... but Renard was shown as having died earlier. They re-used the exact same shot and replaced the earlier dialogue with music.
When Dr. Ormont first shows the radiometer the white vanes are visible on the right side, but when he brings it close to the key the white vanes are visible on the left.
When Ironfoot kicks down the cage door, the damage is inconsistent between shots.
Gordon's adhesive is supposed to suspend a man's weight for only ten seconds, but it suspends West for at least twelve.
When Jim walks into the train compartment, Artemus is already hanging from the adhesive. From then until the time he drops is 25 seconds, despite his counting to ten. When Jim uses the adhesive later, he hangs from it for 26 seconds, virtually the same amount of time, and it's quite obvious that Artemus weighs 10-15 pounds more than Jim.
When Jim walks into the train compartment, Artemus is already hanging from the adhesive. From then until the time he drops is 25 seconds, despite his counting to ten. When Jim uses the adhesive later, he hangs from it for 26 seconds, virtually the same amount of time, and it's quite obvious that Artemus weighs 10-15 pounds more than Jim.
Before going to Hannibal Amusement Park in pursuit of Amelie Charlemont, West remarks that he hasn't had "cotton candy" in years. Upon his arrival there we see people walking around with cotton candy, However prior to the invention of machine-spun cotton candy in 1897 and its public debut at the 1904 World's Fair - as "Fairy Floss," not "Cotton Candy" - making cotton candy was an expensive and time consuming thing and was not very likely to have been happening at an amusement park.
The first time Ironfoot steps on West's hand, the sound comes after his foot has come down.