1. The Ricardos' apartment number randomly changes.

In season two of I Love Lucy, the Ricardos upgrade their living space and move into apartment 3B. You can see the number and letter on the front door. However, the following season, it has changed to 3D, as seen in "The French Revue." Why the change? In the prior episode, "Lucy Tells the Truth," the writers had Lucy say her apartment number is "3D" in an audition to make a pun work.

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2. You can see tire tracks on the road the Bonanza boys ride in on.

In the first season of Bonanza, when the boys are riding up in the opening credits, you can see tire tracks on the road their horses trod upon. Since Bonanza is set in a time before cars were invented, this is an anachronism the biggest Bonanza fans have protested over time. (The thinking goes the tracks were from the truck holding the camera crew filming the scene, so it was a little unavoidable.)

3. The scene outside The Honeymooners' apartment changes.

So much of The Honeymooners takes place in the Kramdens' apartment, and in particular, many conversations take place in front of the window right by the front door. Keep an eye on this window and you'll notice sometimes it shows a scene with fire escapes, and sometimes the scene has no fire escapes, sometimes flipping back and forth within a single episode.

4. A fly crawls up the camera in this 1957 Perry Mason scene.

Ever wished you could be a fly on the wall when Perry and Della were talking out details to a new case? Well, here's a literal fly crawling up the camera in the episode "The Case of the Nervous Accomplice."

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5. Wranglers didn't exist in Rawhide's era, but everybody wears them anyways.

Wranglers had to come out and confirm that their jeans could not have existed to costume the cast and guest stars on Rawhide, but that didn't keep Gil Favor from regularly sporting a pair. The company was founded in 1904, but they didn't even start making jeans until 1947, which the Western's biggest fans have noted doesn't quite saddle up with a show set in the 1860s. 

6. Nan Adams' car completely changes in The Twilight Zone's "The Hitch-Hiker."

In "The Hitch-Hiker," we watch Nan Adams drive for what feels like forever for everybody involved, and her car is a light-colored Mercury. But in a pivotal scene where Nan snaps at the titular hitch-hiker, she swerves that car and for just a moment, her car is changed out for a much darker car that is clearly a different model if you compare the tail fins and headlights.

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7. The clouds give away the camera trick on Adventures of Superman

In Adventures of Superman, any time Clark Kent takes to the skies, he's typically seen flying horizontally. Every now and again, they'd show Superman diving down, though, and that's when attentive fans have noticed that the clouds kind of give away how the effect is being achieved. Even though Superman appears to be flying at a diagonal, the clouds have turned the same angle he has.

8. The grave markers blow in the wind on Gunsmoke.

Here's a divisive "error" among Gunsmoke fans. Some have noticed that if you look quickly in the graveyard scene in Gunsmoke's first season, you can tell the grave markers are made of cardboard or some other light material, because they blow in the wind. Other fans insist this is actually historically accurate, as back in Gunsmoke's time, grave markers were flimsy. Which side are you on? Error or accuracy?

9. The age difference between Wally and Beaver changes.

When Leave It to Beaver starts, it's established that Wally is 12 years old and in the 8th grade. Beaver is "almost 8" and in the second grade. But somewhere in those six seasons, while Beaver aged at a normal pace, Wally's growth seemed to slow. By the final season, Wally is a senior in high school (which puts him five years down the road), and Beaver is graduating 8th grade (6 years past his second grade start). The math seems a little off, but who's counting?

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