That memorable first season of TAOS made great, very frequent use of the locations, actors, and props only a low-budget series could access.
In 'Treasure of the Incas" we see good ol' reliable Dialogue Coach Steve Carr, again cast in a role without an acting credit.
We see the future Mayberry storefront labeled "Samuel Tabor, Auctioneer" which was seen several times in walk-bys by extras in previous episodes.
We see that same alley, where the tapestry-bidding professor is chased and killed, that we recognized from Dr. Ort's office in "The Secret of Superman" which is also where many of Superman's first-season vertical launches from several early episodes originate, complete with the very same flying trash.
For something like the 7th time in the first 17 episodes we see that ominous cave yet again, this time completely springing up from the desolate Sonoran Desert Lois and Jimmy are trying to walk across after being abandoned and left to die.
If the first season of TAOS didn't keep kids from going into abandoned mines and caves, nothing would.
Like any 1950s TV episode there are now-cringeworthy stereotypes of Mexican characters, like the siesta-taking taxi driver who reminded me of the old Three Stooges short with the Mexican guy repeatedly mistaking them asking him to take them to "see Esther" with "siesta".
Funny how things change over the eras: Now many American business types see mid-day power naps as beneficial to productivity.
That's one serious scar across Leonard Penn's face with no explanation of how he got it; that might be an interesting sidebar.
Given how many different roles the talented Steve Carr played in the first season I'm really surprised he wasn't used in subsequent seasons. He was Mexican here; he was in drag for "Double Trouble"; he was the horrified, wordless captive Dr. John Hurley in "Mystery In Wax", which is probably why he wasn't listed in the credited cast since he didn't have any dialogue.
When I lived in Chula Vista CA, between San Diego and the USA/Mexico border, I kept envisioning "Treasure of the Incas" when I walked around filthy Tijuana, trusting no one and making sure to NOT bid on any "genuine" tapestries at the open markets.