During Jim's fight in the main hall, the candles on the candelabra are a bright yellow in the long shots. However, when Cortez grabs one of the candles and twists it, the closeup shows a dull brown candle.
Pike's disguises: Chinese man, sailor, Alcatraz guard
Gadgets: miniature blowtorch, cigar box with knockout gas charge, exploding message box
Fortune cookies weren't introduced in the U.S. until the 1890s, and by the Japanese, not the Chinese. Despite that, Jim and Jeremy receive fortune cookies at a Chinese restaurant.
Fort Alcatraz was decommissioned in 1866, while the series is set in 1869-1877. Despite that, everyone refers to Alcatraz as "Fort Alcatraz."
Gadgets: sleeve derringer, miniature windup hydraulic jack, windup exploding butterfly, plastic explosive
Jeremy's disguises: whiskey drummer, philanthropist Cyrus Barlow
Michael Dunn's folk singing is heard once again, in the record of What Shall We Do With The Drunken Sailor? playing during the sinking coffin peril Loveless places James West in.
The miniature used when Jim escapes the coffin is clearly a GI Joe-style action figure.
Gadgets: chemical leech with flare attached
Disguises: Italian waiter (Salvatore); city gas inspector
Gadgets: suction cup glass-cutter, weighted bullet-slug on a retractable wire
Jeremy's disguises: gambler at club, bookseller conducting auction, Capt. Cecil Allenby Smythe
The two-volume book Shafton's Reflections on Good and Evil is repeatedly identified as a 1575 first edition. Yet when we are shown a page for West and Pike to discuss the code using it, the text concerns Marshall Earp putting down castle rustling.
The stuntman tossed out of the carriage who is supposed to look like Langham has a noticeably different hairstyle.
The stunt doubles who fills in for Barry Atwater during his fight with Bosley has a much fuller and paler head of hair.
Disguises: Dr. Sloan, General Lee
Gadgets: arrowhead bullet with wire, miniature wind-up victrola, trick doctor's bag with a self-inflating balloon
When Jim fires the first "distraction" bullet, the supposedly rock wall bends under it as it hits.
The sign in front of the doctor's house spells his name "Sloane," but the end credits spell it "Sloan."