During the staff meeting at the beginning of the episode, the camera switches between Zak and Richie, but every time it switches, Zak's hands are in a different position. This happens about five or six times and is very noticeable.
In "The King and I" my brother noted that Richie tries to talk Elvis into playing with the "old gang " again. He mentions bassist Bill Black, the problem with that is Bill Black died in 1965 from a brain tumor.
When Richie is selling the company plane, a Mercedes S-Class W126 stretched limo can be seen in front of the plane.
The episode is supposed to happen in 1973 and the W126 was only released in 1981.
Richie and Zak sell the company jet. However, the jet appears to be a Gulfstream III with winglets, which did not fly until 1979-80.
Richie and Zak go to LA to sell their business jet and later meet with Elvis Presley in Vegas. This jet which they owned years had winglets, the vertical extensions on the end of wings. The first aircraft prototypes with winglets did not come out until 1977, the year Elvis died, and this jet could not be a several years old production line model.
Richie has arranged a the sale of the company jet to Lou Meshejian (John Ventimiglia) who arrives in a stretched Mercedes. The car is dated by the 15 hole alloy wheels, which were first introduced in 1985,