'Mork Returns'/Mork: "This is not Disney World!" Disney World was opened in 1971.

'Ralph vs. Potsie':
Ralph: "Alright. Hand it over, Pots."
Potsie: "Not 'til you give me back my lava lamp."

The lava lamp was invented in 1963!

'The Evil Eye':
Richie's band plays "Monster Mash" in the tag sequence. "Monster Mash" was released in 1962.

The restrooms at Arnold's restaurant have the Men's room on the left, and the Ladies' room on the right. But, in all of the shots of the guys coming into the restroom, they walk in making an immediate right.

In one episode, the Cunninghams are on their way to the movies. When Ralph asks them what they are going to see Joanie tells him they are going to see Psycho. However, the episode is set in 1957, three years before the film premiered.

'Westward Ho (Part 1)':
The passenger train scene:
1)There are no electric railroads in Colorado or any of the other states that the Cunninghams, et al passed through on their ways to and from Colorado.
2)The electric locomotive in the scene I wrote about above was a Pennsylvania Railroad locomotive. The PRR did NOT go west of the Mississippi River!

The pinball machine in Arnold's Malt Shop is a Bally Manufacturing "Nip-It", which wasn't produced until 1973.

'Westward Ho (Part 1)':
The passenger train scene:
1)There are no electric railroads in Colorado or any of the other states that the Cunninghams, et al passed through on their ways to and from Colorado.
2)The electric locomotive in the scene I wrote about above was a Pennsylvania Railroad locomotive. The PRR did NOT go west of the Mississippi River!

In one episode, the Cunninghams are on their way to the movies. When Ralph asks them what they are going to see Joanie tells him they are going to see Psycho. However, the episode is set in 1957, three years before the film premiered.

'Mork Returns'/Mork: "This is not Disney World!" Disney World was opened in 1971.i noticed that one too

in an ep set in 1956 howard and marion are sitting on the sofa watching jack parr pn the tonight show jack parr did not take over the tonight show until july of 1957

When the Cunninghams are talking about Fonz's trial, Mr. Cunningham can be seen wearing a digital watch. Digital watches didn't exist in the 50's.

"My Favorite Orkan": Mork is watching The Andy Griffith Show in the Cunninghams' living room. This episode took place in the late 1950s, and TAGS didn't start until 1960.

In one episode set in 1962, the song "I Get Around" by The Beach Boys is heard playing on the jukebox. That song wasn't released until 1964.

The "The Spirit is Willing" episode: In Fonzie's nightmare, the train that ran into the car had an Amtrak locomotive pulling it. Amtrak was not in existence in the 1960s.

In one episode, the Cunninghams are on their way to the movies. When Ralph asks them what they are going to see Joanie tells him they are going to see Psycho (1960). However, the episode is set in 1957, three years before the film premiered.

In “Fonzie Moves Out,” it is repeatedly said that Fonz has lived over the C’s garage for only 6 years. It was actually 8 or 9: “Fonzie Moves In” aired in 1975 (set in 1957), while “Fonzie Moves Out” aired in 1984 (set in 1965 or 1966).

In “Fonzie Moves Out,” it is repeatedly said that Fonz has lived over the C’s garage for only 6 years. It was actually 8 or 9: “Fonzie Moves In” aired in 1975 (set in 1957), while “Fonzie Moves Out” aired in 1984 (set in 1965 or 1966).

Except you have Joanie's time warp. She is specifically mentioned as being a senior in season 7. But then they kept her in high school for two more years after that, and she graduated in season 9. So she spent three "years" as a senior in high school. Maybe that throws off their math on Fonzie living above the garage?

"Fonzie's New Friend": Richie held a party when Hawaii was made a state. The party was in 1956 or 1957, and Hawailli became a state IN 1959!