When the gorilla is shown dancing by himself there appears to be an electrical outlet on one of the walls, even though the show is set in the 1870's.
When the bad guys are shown playing polo one of the men is shown hitting a white ball.
Just before he hits the ball it starts to move thru the air as if it was was being pulled by a wire.
During the opening fight training sequence between Jim and Artie, when Artie falls back on the sofa, he is completely covered by the shadow of the camera.
Veda resists marrying West because she fears he would soon be killed in the line of duty, after which she would have to undergo sati, the traditional immolation ritual for widowed Hindu women. Sati was outlawed throughout India in 1861, several years before the time frame of this episode.
However, attempts to criminalize traditional behaviors (especially by "the colonial invader") rarely meet with immediate success. In Jules Verne's "Around the World in Eighty Days," which was originally published in 1872-1873, Phileas Fogg must rescue a drugged Aouda from an imposed sati ritual.
Even in the 20th century, sati was enough of a problem as to require the drafting of the "Sati (Prevention) Act, 1987"; and as of 2020, at least 250 sati temples existed in India, still glorifying the concept.
When Jim and Arty are telegraphed new instructions, they are told to go to Oklahoma. But the entire run of The Wild Wild West takes place during the Grant administration, which existed from 1869-1877, and the Oklahoma Territory would not exist until 1890, some 21 to 13 years in the future.