The style of lettering and numbers of the registration number (N7845R) are different on the plane wreckage than when it was in the air.
In the end credits, the name of the actor Pepe Callahan is spelled "Pépe Callahan".
George Maharis is clearly wearing heavy and poorly applied makeup until he drinks the special water and becomes "younger."
The 19th century newspaper has three columns with the same text for padding the front page.
Casey describes the "Golden Circle" as a "mo-EE-bus circle". The name of the Moebius Strip is properly pronounced "MO-bee-us"
Both male Mexican characters speak fluent Spanish; however, the Mexican waitress has a noticeable accent.