During the fight with the cat in the mini-arena, West appears to stab the cat in its left fore-paw, but when it is licking its wounded paw a few seconds later, it is licking the right fore-paw.
After Jim gives his word not to escape, the henchman removes Artie's ankle chain, as Jim says, it didn't make any sense to leave them chained as Dr. Loveless knew they wouldn't escape. When Artie is asleep and Jim is talking with the princess, Artie's chain is back on, but when Dr. Loveless arrives later the chain is gone again.
Dr Loveless teeth change from yellow to white throughout various shots.
During West's escape from the box, he encounters an active spider web - but it is not sticky. Webs of that type (used to catch bugs) are normally sticky to hold the unfortunate insect that flies into it long enough for the spider to arrive and subdue the insect.
After Loveless and Antoinette sing their duet before dinner, when West and Wannakee applaud, their clapping would probably not have been audible - their hands would have been no larger than the average finger-tip.
Jim's miniature torch is able to burn through the metal cuff but it causes no damage to his pant's leg.
When dinner is served to the princess, Arty, and Jim in the room, Jim kicks the tray out of one of Loveless's men. But when Jim kicks out at the tray one can see the carrier throw his hands (and the tray) up to exaggerate the effect of Jim's kick.
The standard spring loaded mousetrap that West encounters was not produced until the 1890s which is two decades after this show was set.
Dr. Loveless and Antoinette sing a duet of the song "The John B. Sails" also called "The Sloop John B." This song first appeared in a 1917 American novel, Pieces of Eight, by Richard Le Gallienne, which describes the song as a "quaint Nassau ditty". In 1925, Carl Sandburg published the lyrics in a book called "The American Songbag". This version includes a verse Sandburg wrote and has become the standard for later sound recordings, the most famous of which was by The Beach Boys in 1966 and reached #3 on the Billboard Top 100. The song is not known to have existed prior to 1917, making its performance in the 1870s highly unlikely.
Loveless rolls a black 8-ball at West, but international pool with colored balls were not produced until the beginning of the twentieth century.
Princess Wanakee's hair is 1960s professionally styled hair.
Doctor Loveless paraphrases the line "And miles to go before we sleep", (the original version is "And miles to go before I sleep") which is the closing line of the poem "Stopping by Woods on a Snowy Evening", which was written by Robert Frost in 1922 and published in 1923 in his New Hampshire volume.
If West is supposed to be behind the walls after he gets away from the cat by running into the mouse hole, where did the tiny knife come from?
West says of Loveless' scheming, "Three times you tried, and three times you failed." In fact, West and Gordon had encountered and thwarted Loveless four times before this episode, not three.