When West pulls himself through the window into the Ace Novelty Company warehouse, the "brick" wall wobbles.
At the beginning there is a young woman seated at the table between Mr and Mrs Rawlins. When the shot is fired she is looking directly at Mrs Rawlins. Yet she is never questioned.
Mrs Peacock asks Artemus-in disguise as a preacher-to sample her burgoo which is a Mulligan stew type of dish Closed captioning incorrectly called it barigoule which is a French artichoke dish totally different and definitely not what she was giving him.
In the Ace Novelty Company are dolls of Raggedy Ann & Andy, characters created by cartoonist Johnny Gruelle in the 1910s.
Near the beginning, a street vendor scoops popcorn from an 1893 street cart into a modern (1967) red and white striped container.
By the 1850s, the Daguerrotype photography process had largely been replaced by other processes - its peak years were from its invention in 1839 to about 1849. One of the main reasons for its replacement by other processes were the complexity of the process, the long exposure times involved and the fragility of the plates used. Even at its best, the Daguerrotype process required exposure times of anywhere from one to three minutes, which means that it was wholly unsuited for the snapshot-type of image Artemus used to identify the people at the murder scene - the images of the people would be too blurry or even invisible. Artie's images are way too clear for anything available in the 1870s.
At 4:40, Artemus and James are tied to chairs while a candle burned down to a rope that would drop a burning oil lantern on them. However, the chairs were not secured, so either Artemus or James could have just scooted their chair over and blown out the candle.
After West is tied up under the suspended lamp he makes no effort to escape until the now-captive Gordon arrives.