Non-existent addresses are deliberate, like the phone numbers starting 555 in Hollywood movies.EDIT JAmie beat me to it EDIT Its so people don’t ring the number or rock up at the address and ring the bell. When I do work for film or TV a lot of the work the art dept do is checking that names, address, and things in the script don’t really exist. The graphics guys have to make fake beer labels, food packets, street signs, fake websites and fake search engines viewed in fake web browsers on fake operating systems and there are agencies who’s job it is to check that the fake things we make up don’t actually exist somewhere.
Continuity errors aren’t deliberate but sometimes they are left in if the action is good enough that the viewer won’t notice. There’s an episode of My Name is Earl where his ex wife is having a drunken rant in the bar. There is a pitcher of beer on the table and it dances all around the table throughout the scene. In this case the performance was ace, but the you couldn’t help notice the jug hopping around the table too, but that made the scene even funnier.
Some deliberate falsities too. A character names or address or places will be chosen because they are a googlewack, googling them will only lead to references to the film