**The Dual Staircase Conundrum:**
In Full House, the Tanners have two staircases on their bottom floor. One staircase can be seen in the living room, with it angling around and leading to an upstairs hall.

The second staircase can be seen in the kitchen, with it mysteriously disappearing behind a wall after just a few steps. Having two staircases in one house is odd enough, but it gets even more confusing. Since they're both staircases, they obviously lead upstairs. However, the Tanners' San Francisco house only has one staircase that can be seen upstairs, which just makes no sense.

No matter which staircase the characters go up, they always end up at the same point upstairs. However, when they come downstairs, they can exit either staircase.

This leads to some interesting theories. It's possible that both staircases connect at a point, explaining why they lead to the same place. However, both staircases face the same direction and are on opposite corners of the house. Connecting the two would be needlessly complicated, and it is doubtful that any architect would make this confusing mess of a staircase.

**Architectural Anomalies: Beyond the Staircase:**

The home in Full House and Fuller House is obviously a set, explaining why the layout is so unusual. However, the in-universe house clearly has some problems besides just the staircase. From the exterior of the house, it appears that the building doesn't have an attic. This contradicts the series itself, as Becky and Jesse live in the surprisingly spacious attic shown multiple times throughout the series.

Another weird detail can be observed in scenes set in the living room. Despite constantly having large groups of people over, the room only has a sofa and two chairs, leading to people frequently just standing.

Also, the house has no driveway despite multiple drivers living there. Although there is a garage, Joey moves into it in Full House season 1, meaning that everyone has to just park on the street. While the Full House set is undeniably iconic, it undoubtedly has some problems, with the two staircases standing out as the most glaring example.

**Theories and Speculation:**

The inexplicable nature of the dual staircases has sparked a myriad of theories among fans. Some have speculated that the two staircases may converge at some point, offering a potential explanation for their shared destination. However, the impracticality of such a design, with both staircases facing the same direction and occupying opposite corners of the house, casts doubt on this conjecture. The perplexing layout of the Tanner residence has thus become a source of fascination and debate, adding an intriguing layer to the show's enduring legacy.

**Set Design vs. Architectural Plausibility:**
The architectural anomalies of the Tanner residence extend beyond the confounding dual staircases. The peculiarities of the house's layout, while understandable as a product of the show's set design, have not escaped the scrutiny of eagle-eyed viewers. The absence of an attic in the exterior of the house contradicts the series' portrayal of a spacious attic, which serves as the residence of characters such as Becky and Jesse.

This incongruity further adds to the enigma surrounding the Tanner household's architectural design.

Scenes set in the living room also reveal another curious discrepancy, as the room, despite frequently accommodating large groups of people, is furnished with only a sofa and two chairs, leaving guests to stand uncomfortably. Furthermore, the absence of a driveway, despite multiple drivers residing in the house, presents yet another architectural enigma. The presence of a garage, which Joey temporarily occupies in the first season, necessitates street parking for the other residents, highlighting the peculiarities of the Tanner residence's design.

**Enduring Mystique: The Legacy of Full House:**
The enduring appeal of Full House is undeniable, and its enduring legacy continues to captivate audiences. However, the enigmatic layout of the Tanner household, characterized by the perplexing presence of two staircases and other architectural anomalies, has become a subject of fascination and speculation among fans.

While the peculiarities of the show's set design may account for these anomalies, they have nonetheless added an intriguing layer to the enduring mystique of Full House, ensuring that the enigmatic dual staircases remain an enduring topic of discussion for fans old and new.